Also known as dirty dancing. When a woman slams her bottom on a mans pelvic area while dancing. The man can also lunge his pelvic area forward for a harder bang. This usually performed in a dance club along with upbeat music.
Damn, her ass was twerkin' on my junk, I hope she didn't feel my shlong.
I saw you twerking with that girl. That ass was bouncing all over you.