"Black tank top movies" refer to just that: vanity project films where the filmmaker/lead actor/writer/director is (frequently) seen on camera wearing a (usually) black tank top.
This page catalogues films that do this (presumably) unironically.
Twin Dragon Encounter (1986)
Two weirdly-close identical twins go on vacation only to be met by mercenaries for some reason. They ditch their girlfriends to embark on an attempt to do a Bill & Ted inspired action movie a full three years before the release of Bill & Ted, and with a singular goal: recovering the poster of themselves that the mercenaries stole. The explosive action shot in slow motion will keep you on the center of your seat.
Fight of Fury (2020)
A jeet kune do practitioner uncovers a sex trafficking ring in Los Angeles. After a group of women willingly ingest an invisible drug off a phone screen that actually goes into their drinks and was offered by a complete stranger in the middle of the afternoon, they immediately accept their fate. It's up to Brandon, who is also Shuny Bee according to the backgrounds of the dojo scenes, and he sets off to right these wrongs before deciding he was bored and ending the movie on a freeze frame without really solving anything. Starring the venerable B-movie star, the Griffith Observatory.
