butt thunder 

a colossal rumbleing that explodes out of your ass, something that shakes the cheeks.

After a heavy night of drinking the walls were shaking with my angry butt thunder.

butt thunder by Jon Chris Ashly June 11, 2006

Thunder-butt 

(noun/slang) Complimentary slang name referring to an attractive, thick female whose attributes (i.e. ass, thighs, legs, etc.) are proportionally large, noticable, and desirable. Though not a law, such females can weigh in at the neighborhood of 200+ lbs.

April was a hunka-hunka burnin' love. That thunder-butt gal had a body that could ride your dick into the ground.

Thunder-butt by Nikki Stixx September 19, 2019

Thunder Butt 

the fat guy at the pound in homeward bound

sassy (the cat): "this way thunder butt"

Thunder Butt by Ty54 May 31, 2009