It means to be serious, but in a bloods term.
In English, A Normal white boy would say, " Oh my god? Are You SERIOUS?!?! "

But a true hound would say, " GOD DAMN, BLOOD ARE YOU BERIOUS?? "
by Kilo G March 4, 2004
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Another form of 'Seriously', first letter substituted with another letter, 'B'.

Pronounced: BEE-ree-us-lee
Jan: "Dude, OMG, that movie was DA BOMB!"
by JANJULKEL October 18, 2010
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