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1.
The practice of receiving an instant message and immediatly typing 'brb' to avoid talking to someone.
Dude, Joe is totally brb'ing me... every time i catch him online when he isn't away he leaves right after.
by Dizzle~! December 15, 2005
 
2.
The state in which someone will be right back. Originally used on Internet chatrooms along with the acronym brb.
Blue: brb
Green: Where's blue?
Yellow: He's brbing.
by vortico November 03, 2008