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a stupid person or a hole
josh is a butt muscles
by ABITTY February 27, 2009
3 2
Douche Bag.
White Hat.
D. Metzler From Baltimore Maryland
"Butt Muscle Is The New Douche Bag."
by Windsah Clang August 21, 2009
0 1
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!
by D-Peezy February 25, 2009
0 2