an ass that is extremely big, yet it is so sloppy because it has wrinkles or flaps of grease everywhere - Just like a Big Mac.
Guy 1: Yoo I got some ghetto booty last night! She got that big ass son.
Guy 2: Aww hell, that ain't no good ass, that's a big mac ass.
Guy 2: Aww hell, that ain't no good ass, that's a big mac ass.
by TheOtherWong February 9, 2010
Did you see that chick on the treadmill with the big mac ass?
Yea, I just want to go take a bite out of it!
Yea, I just want to go take a bite out of it!
by crackle1102 August 18, 2014