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1.
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.
by Andrew January 13, 2005

Words related to mayobutt

buns mayo mayo dick mayo hams mayo man
 
2.
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.
by mayobutt November 06, 2009