to give five with the back of the hand;
You got that bitch up the ass..give me some knuckle on that one.
by Anonymous August 5, 2003
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Knuckling is the act of 2 bros fist bumping eachother. As the two bros fist bump eachother, a third bro proceeds to slide his dick between the other bros touching knuckles. He then proceeds to fuck their knuckles.
Ben: Are colin and adam knuckling with that guy over there?
Sean: Yeah that dudes dick is gonna be super sore wow.
by Zsean January 6, 2018
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Any friend that assists you in your endeavors, or that you assist in theirs. A knuckle is of equal standing and not be confused with a minion, even though they may let you take the lead in situations where they are assisting you, just as you let them take the lead when you are assisting them.
Some of my knuckles came over last night and we gave the car a tune up and put in new speakers.

I burned my songs onto a mix cd for one of my knuckles.

One of my knuckles found a generator for next weekend.

by squegie August 30, 2005
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a precise point on ones finger made efficient for causing maximum damage
male b: im so mad at your mom, she knuckled down my house last night!

male j: we have the same mom! knuckle head!!
by jordan sollinger January 5, 2008
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4 grams of a substance, preferably cannabis
Let me a knuckle of that Chemdawg
by speedcore909 September 8, 2017
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Hey Marty, you got any knuckle?
by Ghostship September 14, 2006
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When a quality nugget is so densely dank that it makes a noise identical to that of someone's knuckle when it is tapped on a surface.
I just dropped some serious bills on that zip so those buds had best knuckle.
by The 4th Horseman July 13, 2008
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