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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Alabama's largest producer of Remy-De-Martyn Hobo Wine. The name originates from the style of chin worn by Magic Benstead, a curse he has had to bear since birth.
HOBO!BENNY-BENNY-BUMCHIN! Hobo Wine... do do do dooooo!
by Shadow Of Death September 27, 2006
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