Top Definition
To have a moment or point in your life when you are considered an idiot. A.K.A. dumb ass. Comes from the 2 terms knuckle head, and dumb shit.
1. I can't believe you didn't shift out of first gear after proceeding 100 miles an hour, you're a knuckle shit!

2. Josh-"Did you guys drill the hole out for the waterfall bolts on tower 13 yet?"
Bobert-"No, not yet."
Josh-"Well, now you've gotta go drill that hole out even though I told Randy I would do it, you fuckin' knuckle shit!"
by The man from the lene November 06, 2007

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