The act of performing sexual intercourse by thrusting ones member into the armpit of ones sexual partner, mimicking the feeling of a very tight, yet stinky vah jay jay.
My girl was on her period, and she doesnt do anal, so we did it in the dirty pocket instead.
A mix between a dirty Sanchez and a Alabama hot pocket. So you open up a chicks vag, shit in it, then fuck her, then take your dick out and rub the shit on her lip, creating a mustache.