look up any word, like wcw:

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