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1.
Bedunkadunk is a word to describe a really nice ass on a woman. It can also be used to describe a fat chick's ass, or an ass on a chubby chick.
"Damn man, that chick has a bedunkadunk!"

"Wow man, look at that bedunkadunk!"
by Travis July 05, 2004
 
2.
a person with big legs/thighs.
did you see the bedunkadunks on that chick?
by jordan April 18, 2003
 
3.
A very large ass on a person.
Oh man, I saw this woman with the biggest bedunkadunk today.
by Heathie September 23, 2005