Urban Dictionary: Ass-knuckle

1.	Ass-knuckle
	Someone who is clueless or stupid. "Dude the new guy is such a dumbass! "for real, he's a total friggin' ass-knuckle! buy ass-knuckle mugs & shirts ass assknuckle dumbass stupid moron by Skin bone May 21, 2011 add a video

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