word used by males of the five boroughs/L.I. to address other male friends; usually white, fist-pumping, sunglasses-at-night wearing--GUIDOS or surprisingly the white, urban, rap listening type. Increase in use of this word due to the success of HBO's "Entourage".
It can be used in the beginning of a sentence - "Bro, you heard the new Benny Benassi?"
..or the end - "Don't step on my new Diesels BRO"
..or even the ever popular sentence sandwich - "Bro do it up bro".