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Random
When your butt very strong. It doesn't jiggle but it is big. Also when you hit the but and it hits you back.
Ayo, you know that girl Tatianna. She really got a Muscle butt. It looks like it lifts the weight on weekends.
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A girl who has a ass that is so muscular that if she wasn't muscular it would be straight flat
Damn maddys ass is so muscular she got a muscle butt
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When a girl got a fatass and you got to stop and reevaluate your whole life.
Damn, that girl's got a fucking muscle butt!
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Douche Bag.
White Hat.
Poser.
D. Metzler From Baltimore Maryland
"Butt Muscle Is The New Douche Bag."
The name you give to a friend(or foe) , for being a dumbass.
DUDE!, i saw Matt talking to these hot chicks yesterday and he told me that he was busy, what a butt muscle!