look up any word, like bootylicious:
1. ga-dunk-a-dunk
A big, round, bootylicious ass.
Missy Elliott - Work It
"Think you can handle this ga-dunk-a-dunk dunk"
by KeeWee Jan 12, 2005 add a video
2. ga-dunk-a-dunk
a big fat ass
a big black ho and her ga-dunk-a-dunk ass
by joe da flava May 14, 2003 add a video
3. ga-dunk-a-dunk
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."
4. ga-dunk-a-dunk
the male sexual organs
she hacked off his ga-dunk-a-dunk when she found out he was cheating
by XxpartyinabagxX Feb 2, 2005 add a video
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