When you dance around like an idiot while angry, listening to hateful music, like Drop the World by Lil Wayne, and letting out your emotions to make you feel better. Usually done in the dark confines of your room all alone with the music blasting.
NOTE: In some instances, hate dancing can make you angrier than you already are.
Ugh, man, I was so angry last night when that person called me fat on facebook, so instead of waiting until tomorrow to punch her in the face, I turned on Lil Wayne and started hate dancing, and I felt less angry after just one song.