One (or more) males in a group who always think they are funny, but instead embarrass their friends - especially around women.
Tom: "Ugh, I was talking to these two hot chicks, and then Doug comes up outta nowhere and starts dry humping me, thinking he was being funny"

Dave: "What a butt clown...I've got his car keys, let's just take off and leave him here"
by frostboy74 September 16, 2009
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Person who has an unusually large and comical looking ass coupled with wide hips, especially if they have a normal upper body and thin waist. Mostly seen on women.
Clown butt is NOT badonkadonk because clown butt does not appeal to ass lovers.
Man, she's got major clown butt.
by Rick Cain November 30, 2007
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