a butt that you want to slap your man junk on,
a combination of the words fadonk and badonkadonk.
Dam, look at her fadonkadonk!
by rfjdavison December 20, 2009
noun; a fat white chick with no ass
EW! God that fadonkadonk could make a baby cry!

or

try as she might, the fadonkadonk could not please the crowd
by Kyle Perkins October 16, 2007

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