1) An alternative to first base that is used mostly by conservative Christians and, rarely, Zoroastrians. This act is done by a couple interlocking knuckles and thrusting their arms back and forth (Noun)
2)Knucka (Noun)
3)Knucking (Verb)
4)Knuckable (Adjective)
"Sammie thought he was being all sly, but I saw him knucking with his girl before 4th period"
by Jookill4 June 11, 2008

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Top Definition
To hit a person with your knuckles.
Knuck if you buck boy!
by C.Phil January 14, 2004

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1) fight
2) step up
Knuck if you buck, boy!
by Vaeh October 06, 2004

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To beat the shit out of someone or something using your bare hands
I'll knuck the fuck out of you if you touch my women
by E-rock April 08, 2005

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When two people hit their knuckles together (when hands are in a fist). Many times used instead of a handshake or high-five.
Upon seeing friend...
"Hey what's up brother?"
Action: Knucks.
by Becky24 October 19, 2005

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Short for brass knuckles.
Don't punch me when you're wearing those knucks.
by Rodney Basil October 05, 2003

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A synonym to pound it. It is a fist to fist contact in a congratulatory way. Often used to replace a high 5 or shaking hands.
Steve: Hell yeah! This Euro-trip rocks!
Jerry: I know, check out that european ass!
Steve & Jerry: Knucks!
by Benormous April 18, 2006

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A hand gesture characterized by an individual forming a closed fist with one hand and extending the index finger to the proximal interphalangeal joint only. The joint should be flexed so the distal phalange points inward toward the palm.

The gesture is executed when two participants each form this fist and lightly tap their PIP joints together.

Often initiated by one person doing or saying something really cool and the other person recognizing and respecting that action by holding up their fist as described above and saying "knuck".
Bree: Oh boy, Daddy that was the sweetest dickin' that anyone's ever given me!

Travis: KNUCK.
by Honey Bree July 22, 2010

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