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2.
What you call somebody who lives up there own ass.
"Woah I look good"

"Dude your such a butt haven"
by HotBitch January 02, 2006
 
1.
Noun. Singular. US English colloquialism. A comfortable place in which to sit.
My favorite butthaven is this sofa.

This car seat is so uncomfortable, it's no butthaven.
by MustafaMustafa67 January 06, 2011