What's the Pac-Man-like video game seen in the movie "Joysticks"?

Hmm, interesting. I haven't seen the movie, but the imdb page says, they made a deal with Midway and had license to use pacman, super pacman and the at the time of shooting unreleased satans hollow. Source.

I did a reverse image search on your screenshot and it came up with Streaking (by Shoji). This looks like the game in your screenshot.

The arcadecinema page of Streaking says this:

In the movie Joy Sticks, an apparent clone of Streaking (credited to Computer Kinetics Corporation) is played in several scenes, and is referred to as "Strip Video" (or "Stripper Video Game" in the credits).

Since I'd seen Joy Sticks prior to Streaking being added to MAME, I was shocked when the game showed up on the MAME WIP page. I had no idea it existed beyond the movie. Given the little information that's available about the game, it's unlikely that it was ever widely distributed.

There are several apparent differences in "Strip Video". The player can be either male or female. The character starts out clothed, and loses clothes as the game progresses (as do the characters in the movie). The gameplay also seems considerably faster, and there is no Fatigue meter, both of which would have helped Streaking considerably. Finally, the color palette is different, but this could be attributed to an incomplete MAME driver.

So, apparently this is an early erotic game in a pacman style and it was forked and improved specifically for this movie.