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
the fat guy at the pound in homeward bound
sassy (the cat): "this way thunder butt"
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.