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A best friend that you never see. He's always hiding or just at home.
Named after the infamous best friend you never see,

Osama Bin Laden
Mike:Hey where's Joey at?
Daniel: IDK man he's being a real Brosama Bin Laden
by BertiCoosBay December 11, 2010
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Someone who you think is your bro, but is actually vicious foe. He'll send your hopes flying, and then send you crashing.
I thought Matt was my best good friend. The modaf**a turned out to be a Brosama Bin Laden.
by duq_pub February 19, 2017
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