When you decide to transform yourself into a sexy beast (in body or spirit) in order to make another person feel a certain emotion (anger, insecurity, jealousy, longing, loss, etc). Usually happens after a bad breakup and the act personifies pettiness in it's final form.
Friend 1: Sorry you broke up with Xander. He was an ass anyway.
Friend 2: It's all good, I'm going to hit the gym and get spite hot just to post pictures on Instagram and rub it in his face.