A circular/gyrating movement involving the hips.
Hey man, do the Stan!
Hey look, he's doing the Stan!
Hey, u can't play without doing the Stan first!
The act of cocking one leg on a table whilst masturbating. Preferably whilst wearing exceptionally tight football shorts, one testicle hanging out of the leg, the penis protruding from the other.
"Oh my god, what's that guy doing in front of that floor to ceiling window!?"
"Chillax, bro, he's just doing The Stan."