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1.
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.
 
2.
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."
by Glenn S April 01, 2008