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(n.) From Latin, gaduncum (rubbish) + duncanus (suitcase). Rubbish in the receptacle. Colloq.: Junk in the proverbial trunk.
Gentleman #1: Dayam. She got it going on.
Gentleman #2: Word up. That's some gadunkadunk.
Gentleman #1: Fo' shizzle my nizzle.
by gadizzle October 23, 2004
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Ass that requires custom fitting (ie. the special fitting store bought jeans)
What I wouldn't do to pull up to that Ga-Dunka-Dunk and smack that monkey.
by Ga-Dunka-Dunk October 25, 2003
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when guys have a bubble butt

aka a large behind that is pronounced and round.
bob: "do these pants make my butt look big?"

sherman: "yeah, bro. you've got some major ga-dunk-a-dunk going on."
by jess rose August 19, 2006
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