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.
by TheOtherWong February 08, 2010
An ass that is so big and amazing that you you just want to take a bite out of it.
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!
by crackle1102 August 18, 2014

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