1. a tennis or badminton move in which a player takes a small feminine-like step, throws the ball/birdie up into the air, and in an attempt to serve, twirls the racket with a complete wrist motion, around their own hip area, to gain leverage on the ball. note: this move has a failure rate of 95%.
2. a move inspired by a dude named andrew in 9th period gym class while playing against two girls that he secretly has a crush on, but they actually know.
Kait: Wow post! What was that funky move you just did?
Lauren: It's called a post twirl!
Both: HAHAHAHAHAHAHA
Male on top of the Female and once inserted he begins to slowly rotate his body round in a 360' circle whilst thrusting. the woman must lift his legs as they go over her head, and if he hits a good spot the woman is allowed to stop him.
The tricky part is making sure your member doesn't 'pop' out while you're doing this. ... And to keep from laughing. Otherwise its great.
Girl 1: My boyfriend and I tried did the helicopter twirl last night!