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)

Anatidaephobia is defined as a pervasive, irrational fear that one is being watched by a duck. The anatidaephobic individual fears that no matter where they are or what they are doing, a duck watches.

Anatidaephobia is derived from the Greek word "anatidae", meaning ducks, geese or swans and "phobos" meaning fear.

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.

1. Having a chin that resembles an asscrack.

(n.) A chin shaped like buttocks.

Occasional nickname for Ben Affleck.

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.