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3.
When a girl's ass is so big that you can see it from the front.

(also be-donk-a-donk-donk)
1. Damn, that bitch got a nice be-donk-a-donk.
by The Platinum Playa June 25, 2005
 
1.
adj. large, round
usually used to describe an woman's ass
see junk in the trunk
My girl's got a nice bedonkadonk ass.
by Hackster March 04, 2004
 
2.
noun. a girl's sexy ass, usually large and jiggly
The best kind of bedonkadonk are the ones that keep on jiggling after you smack 'em.
by Fugaho June 16, 2008