baddadonk

1)A terrifyingly huge ass. Not just round or averagely big but wide and steep enough to balance a cup on it.

2)A variation of the word badonkadonk

3) A really phat, unreal ass that Kim-K or Nicki Minaj has got nothing on.

Gabby: Yo, Eedris! I met this girl at the club yesterday and she got the nicest baddadonk I ever seen.
Eedris: How big we talking?
Gabby: This bitch could sit a baby on that ass!
Eedris: No freaking way! Did you smash though?
Gabby: Fuck yeah I did! It was soft too.