From the French abbreviation "Beau Goss" meaning beautiful, handsome man. This abbreviation is often used to refer to a boss playa. He is man that owns respect from from all fellow BGs. His other bros wanna be a BG like him and try very hard to achieve this legendary alpha-male status.
Peter is such a douche, he hooked up with rebecca and now he's ignoring her." "No no no my friend, that is not a douche, THAT is a BG.