A cross between the name "Brian" and "Vagina" used to piss off, irritate, or simply make fun of those named Brian. Typically used to emphasize vagina-likeness to a man. Variations (John to Vajohna) can also be implemented.
"What, you don't want another shot of Beam? You Bragina."
The cleavage created by a fat man's man boobs with folds of fat resembling a vagina. The name is derived from the fact that the man boobs require a bra.
Look at that overweight puerto rican man, he is always sweating and his tits make a bragina.