An extension of the common slang word bro. It's origin is unknown, but it has come to mean a bond of brotherhood exponentially stronger than bro. It is the deepest form of friendship, and the cloest two men can be without being homosexuals. In order to fully witness and realize the potential of so called 'brosivity', one must mix good friends with lots, and lots of beer.

a term directed at you're best friends (you're non-backstabbing, non-bitchy, non-girly, non-kill joy friends) A Brosif is someone that's down to chill and always down for a good party.

A name to call your brother if he's middle eastern

the best friendship i guy can have to another guy before being gay

Middle eastern brother/best friend. Do NOT call your sister brosif because it is a very offensive term to call a woman