Very simply, a hat for your bum.
Dan was walking down the road when he noticed his bum was getting sun burnt. At this point Dan wished he had a bumhat.
by PMizzle July 12, 2005
Used in the same context as bum clouds .
Oh bum hats.
by SkuM001 December 13, 2003
The act of putting asomeone's exposed butt close to someone else's face who has passed out at a party and taking a picture or video of the act.
We gave John a bumhat last night.
by boothash October 16, 2004
Someone whos face looks so bad it resembles a rectum
Madelaine is a bumhat
by Pete Willis June 03, 2003

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