When (mainly males) (unless you be a tranny) are totally naked and do circle movements with their hips so that they get their genitalia swinging round and round in almost-perfect circles. This action is usually done in front of a mirror: it can be very entertaining for guys ya know.
Guy1: Dude, you know that film 'Bruno'?
Guy2: like, who doesn't?
Guy1: yeah, i love the part where he flops his cock out and starts willy wanging.
Guy2: are you bent?