Butt-Bounce 

A popular move in video games, also called the ground pound

Mario took out bowser with a stunning Butt-Bounce

Butt-Bounce by Blaster 2.5 September 25, 2005

butt bouncing 

Sitting on a guy and bouncing that ass.

She was butt bouncing for me last night.

butt bouncing by none o' ur damn bisness November 29, 2013

Butt bouncing 

The act of sitting on the floor and bouncing up and down on one’s butt while throwing a tantrum of frustration and/or embarrassment.

Barry was butt bouncing for an hour after the break-up with Carli.

Butt bouncing by Bunnybj October 3, 2018