Top Definition
Going atleast one knuckle deep into a butthole. Preferably done to the opposite sex during intercourse.
Dude, while I was railin that chick out last night.. I started knuckin the 'B' and she loved it!!
#knuckin the 'b' #knucked the 'b' #knuck the 'b' #knuckin his/her 'b' #knucked his/her 'b' #knuck his/her 'b'
by HBK and JIMMY May 08, 2010
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