The growth of an inflammed, festered, and bloody hemorrhoid that creates a groove-like affect in your feces.
Dave, don't do it. Jeff has an ass knuckle, that's not going to be fun.
ayon kay Sean Piner ika-30 ng Setyembre, 2006
Someone who is clueless or stupid.
"Dude the new guy is such a dumbass!

"for real, he's a total friggin' ass-knuckle!
ayon kay Skin bone ika-21 ng Mayo, 2011

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