I'm still unable to tell you what it is, but I can at the very least help you rule a few things out. I can tell you it's definitely not Flesh for Frankenstein, Revenge of the Dead (aka Zeder) or Student Bodies, all of which I've seen multiple times.
Cutting Class...maybe. I've only seen it once, a LONG time ago, and while the particular scene you describe doesn't ring a bell, I don't have crystal clear memories of this particular film.
Freddy's Nightmares, I'd say probably not. I watched a marathon of both seasons a few years ago and no scene that I can recall fits your description. Also, it was a broadcast TV show during a time when such violence on broadcast TV was a big no-no, which even further whittles down the likelihood.
The Hitchhiker's a strong possibility, though, and fits the time frame you claim to have seen the scene you've described (it ran from '83-'87). The only problem is that while the show is available on DVD, each season features only select episodes so it won't be possible to check EVERY episode.
I can tell you, however, that I received The Hitchhiker Season 1 as a screener several years ago and watched every episode on it, and as far as the select episodes on that disk goes, the scene you described doesn't ring a bell. BUT, I do have a copy of my review of that disk wherein I provide a recap of all ten episodes it contains. Check them out below and see if anything rings a bell.
From my review:
Paul Verhoeven directs Peter Coyote as Alex, a former actor turned first time director pressured by an obnoxious producer to make his first film a commercial success. Unfortunately, Alex is hindered by a lousy lead actress named Leda whom he nevertheless falls for. After rehearsing privately with her, he makes a dinner date. That night when Leda answers the door, it's not Alex standing there but someone wearing the same white fright mask as the killer in the film she's appearing in (see image). He continues to harass her in ever more threatening ways until Leda seemingly begins to go crazy. As directed by Paul Verhoeven (Robocop, Basic Instinct, Starship Troopers), this episode features his usual outlandishly stylistic approach. I think I even saw a gay Spider-Man in there, but don't quote me on that.
This supernatural tale features Margot Kidder as Nurse Jane, an overbearing, domineering night shift nurse at an old folk's home who has a nasty habit of stealing precious jewelry from her wards and hocking them through her small time musician/equally small time con boyfriend, Johnny. When EMT's bring in the sole survivor (Darren McGavin) of a collapsed building wherein dozens of bodies were found, Nurse Jane steels a valuable looking ring from the old man's finger, which causes him to break free of the restraints she'd put him in and go after her. Will she escape, or will this mysterious old man get revenge for all the old folks in the home?
The Miracle of Alice Ames
Joe Pantoliano is Brother Charles, a self-styled "reverend" whose Church of Limitless Love doubles as a bordello from which he pimps out brainwashed women to raise money for a new church. A naive young woman named Alice appears and Brother Charles shares with her his dream of building a new church. When Alice sees one of the other women out turning tricks, she believes it to be the way Brother Charles "spreads love" and picks up a man of her own. However, when the man attempts to do the nasty, she exhibits signs of the Stigmata. Thinking it was a brilliant hoax perpetrated by Alice to raise money for the church, Brother Charles offers to split the business with her and attempts to get into her pants. But, he's going to find out the hard way that her Stigmata was all too real.
This nicely film-noirish tale features Willem Defoe as a writer who fakes his own death in order to get revenge on his adulterous wife Debby (Dayle Haddon, the "Cyborg" of title in the Albert Pyun/Jean Claude Van Damme flick) and his editor (Barry Bostwick, Rockie Horror Picture Show). What follows is a series of turns, twists and betrayals which results in one of the best episodes on the disk.
Man's Best Friend
A clever and quirky tale with Jekyll and Hyde themes, this episode stars Michael O'Keefe (Caddyshack) as Richard Shepard, a distressed yuppie who goes to house sit for a friend after his wife Eleanor (Jennifer Cooke, Friday the 13th: Part VI) kicks him to the curb. While there he finds a large, white dog, which he takes in and names Big Boy. He pesters his wife's friends trying to find out where she might be after he calls her and gets the answering machine, but none of them will help him. Soon, each of his wife's friends turn up dead, seemingly attacked and killed by a wild animal. Chock full of sly dog references and in-jokes and featuring a tongue in cheek performance by O'Keefe, this episode's a winner. Oh, and those who thought Cooke was hot as the female lead in Friday the 13th: Part VI and wondered if she looked good naked, I can tell you, yes, she has some very nice puppies. Oh, a dog joke!
Garey Busey stars as the host of a Gospel-themed call-in radio show where people call in to confess their sins on air. About to be picked up by a national broadcaster, it's the worst possible time for the figurative skeletons in his closet to come out - but they do. Though this episode tends to be a bit heavy-handed with its religious and overly supernatural overtones, Busey turns in a fantasic performance.
The Legendary Billy B.
Though featuring a performance by genre favorite Brad Dourif, a lead role by Kirstie Alley and a supporting role by none other than Andy Summers of The Police fame, this episode about an unscrupulous investigative reporter and her photographer discovering that a rocker thought to be long-dead may still be alive is sunk by shameless overacting on Alley's part, and a rather limp story. Noteworthy in the series solely for the appearances of Dourif and Summers, this is the weakest episode featured on the disk.
Christopher Collett and the intense James Remar star in this tale of two robbers, Ron (Remar), a ruthless killer and Jimmy (Collett), the younger of the two who was raised by foster parents and considers Ron the only family he ever had. When the two break into the model home of a suburban housing development to get into a safe, they're surprised to find a family living there. Psycho Ron decides the family's got to die, but Jimmy suddenly finds his longing for a real family interfering with Ron's murderous plans. This episode, though not the best, features a clever twist at the finale and Remar shows his usual flair for playing a cold-blooded killer.
Why Are You Here?
Brad Davis plays Jerry Rulack, host of a late-night exposè show which focuses on the glamorous yet dangerous night life in the big city. Along with his camera-women, his search through one particular club leads him to Donnette (Helen Hunt), a rich girl who hangs with the party people because her always-absent parents have left her constantly feeling alone and empty. Hungry for depictions of true danger behind the glamour, Jerry soon finds himself in a position where he should have known to be careful what you wish for.
In The Name Of Love
This little number starts off well enough as a hit-woman with a penchant for taking out womanizers decides it's time for a break and goes on vacation. When she gets to the resort she falls for the fitness instructor, who may or may not be having an affair with a married woman. You know this one's going to end up bad, but in the meantime it takes a couple weird and nonsensical turns and almost lost me. But it makes up for it with lots of nudity on the part of lead actress Lucy Gutteridge. So, it's got that going for it.