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1.
the act of inserting two fingers into any orafice of the "dubknuckers" choice to the knuckle.
I dubknucked that bowling ball like I dubknucked your mother.
by RedZones September 16, 2010
 
2.
Fist bumping twice in immediate succession. There should be no more than an inch between the fists at first separation, nor should it last longer than a heartbeat.
Person 1: "Yo fist bump!"

Person 2: "Nah, bro. Dub knucks!"
by Meetwood Flac July 12, 2012