Top Definition
1. When you wear flannel boxers in the summer and your ass crack sweats.

2. When someone spreads a healthy portion of mayonaise in your ass crack.
It is 95 degrees out and Carl's got some serious mayobutt goin' on.
af Andrew 13. januar 2005

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when you have a huge jiggly ass. similar to having eaten too much mayonnaise and having it go straight to your ass.

move that ass woman.
look at that boatload on her ass--talk about mayo butt.
af mayobutt 6. november 2009

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