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A chin that look like an arse (in some cases). In others, they can be very sexy and attractive. A nice facial feature (most of the time)
by Sophy June 09, 2005
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A chin that has a cleft in it giving it the characteristics of a bum. Most people will find the bum chin to be very attractive as it has a certain heir to it. Often associated with power and sophistication. The bum chin is a sign of a distinguished gentleman.

People who have bum chins are more likely to be successful and chosen by the opposite sex, for mating.
John Travolta has an incredible bum chin.

Steve must be successful, just look at that bum chin.
by Steve Christensen December 17, 2007
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1. Having a chin that resembles an asscrack.
Wow, you have a really ugly bumchin under your mouth!
by Bithicus March 10, 2005
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A 'Bum Chin' is a guy or a girl who has a chin shaped like a bottom. They have an abnormal cleft that if you squint closely, looks like a pert behind.
Man..it looked like he was doing a hand-stand!
by Johnny Internashinal April 21, 2004
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