Top Definition
Describes something that is really great.
The acoustic version of "Creep" is really greatass!

Wow - she is still on the phone and my head is pounding - this is a greatass night. (Sarcastic)
by JasonEvans July 18, 2006
1 more definition
5 Words related to greatass
1. A term used to describe someone who actually has a great ass.
2. A term used by those who do not actually know if the person they are speaking of actually has a great ass. They just see that they are hot, look at their rump, and say that they have a great ass without knowing the actual quality of said ass.
Tenpenny: "Look at Jill's rump. My, she has a great ass."
Frank: "Jill's face is really great, but she is flat as a pancake in the back, you silly fuck."
by Andromeda1232 January 17, 2009

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