That's funny! I just happened to catch that scene this year. For unexplainable reasons, AMC feels the need to show "Halloween 5" fifty times during "Halloween Week"😱 I mean they don't even start with the first film anymore. They just show H5 over and over.
Anyway.....Yes, I agree, it's a tickle scene. Two fruitcakes are at a costume party. The girl is sitting on couch and some guys comes over and starts messing with her. He takes her foot in his hand and clearly tickles her. She giggles, then kicks a little and pulls her foot away.
It's not a great scene, but it does exist. Horror films can be a hotbed for tickle scenes if you're paying attention. I posted quite some time ago about a terrible "Friday the 13th" ripp-off called "The Burning." The movie is utter crap, but it has a nice tickle scene.