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(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.
by Nikki Stixx September 19, 2019
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1. A gigantic, flabby, asymetrical, disgusting ass. Resembles a thundercloud due to its shapelessness, constant shifting, and that it strikes terror in the hearts of small children. Has been known to nuetralize erections and make beer taste flat.
2. A fart that echoes for at least 3 seconds.
1. I almost threw up when I saw that thunderbutt!
2. That thunderbutt was fucking nasty!
by Admiral Anarchy October 21, 2009
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A person (usually a woman) who's ass is so massive that when she walks her ass creates a thunderous rumble that frightens everyone around her.
Daaaaaaamn that womans ass is HUGE. She's got a Thunderbutt
by logicalkaos September 05, 2011
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