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1.
adj.

A combination of the words "boss" and "awesome". It can be used as an adjective to describe something or someone that is completely off the hook, sickly gnarly, incredible to a level beyond comprehension, and/or they/it are just absolutely word.
That shit Michael Phelps pulled at the '08 Olympics was fucking bosome.
by Bosome Bro January 04, 2010