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A woman who possesses a beautiful round posterior, but unfortunately is otherwise quite unattractive.
" Dude, this girl ahead of me in line had a Fine Ass J-Lo booty but when she turned around I saw she was a total BadonkaDonkey"
by Theonardo Spandexter June 17, 2009
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2
A donkey, (equus asinus) with an abnormally large posterior (gluteus maximus).

Or, an ass with a big ass.
"Man, that mule has a big butt"

"Yeah, it's a real badonkadonkey"
by Cracker2000 August 23, 2004
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