Top Definition
One who is in a perpetual state of "away" on any instant messenger.

A BRBiatch may reappear for a brief period of time to say a few words before saying "brb" again.

See also: fearedmachina.
fearedmachina: okay i'm back
phubans: cool, wb!
fearedmachina: thanks
fearedmachina: brb
phubans: dude, stop being such a BRBiatch!
by phubans July 11, 2008
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