usually done by poofs and dykes for the poofs they insert their fist through the other poofs arse thus like punching it and for the fucking dykes they have a choice the arse or minge
When one is listening to an orgasmic pop/rock radio ballad with lots of Auto-Tune and effects, and can't help but put one or two fists in the air to the music.
"Bro, you're fisting hard to that new Fall Out Boy record..."