1. black people slang for fighting, orginated from the dirty south and heard in crime mobbs single "knuck if you buck".
2. Is used when one homie wants to throw down torwards another homie.
3. Is commonly seen when crunked white boys who think they are black, try to dance and get down.
(1.homie):Yo nigga!
(2.homie):what?
(1.homie):KNUCK IF YOU BUCK!
(homie 1 & 2): KNUCK IF YOU BUCK BOY! KNUCK IF YOU BUCK BOY!KNUCK IF BUCK! KNUCK IF YOU BUCK!
by LIL'JA March 20, 2005
Knuck = Knuckles.
Buck = A male deer.

Knuck if you buck = Used when hunting. Simply hit your knuckles together if you see a male deer to create the effect of 2 deer fighting. (The antler effect.)
*deer approaches*

"Quick, knuck if you buck!"
*knucks*

...the buck (male deer) comes, and you can do as you wish with it.
by T-pain November 16, 2005
A secert term amongst homosexuals. (A question inquiring if you scream while having butt sex preformed upon you.)
Timmy: "Knuck if you Buck?"
Tommy: "Hell yeah!"
by TruGangsta October 07, 2004

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