1. 'be right back'- i'll be back soon. usually used in chatrooms or msn when the sender needs to take a huge dump but is too scared to say 'i need to do poos'.
-a polite way of letting the other person/people know that if they send messages you aren't going to respond for a bit.
-a good way to delay a conversation if you are sick of them
basil: hey wat you up to tonight?
sherryl: brb
basil: neato
by juvenileinclination November 21, 2006

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Black retarded babies ,A taboo subject not to be discussed
Did you hear what happened on the news today ?"Oh BRB " and the conversation ended
by soulwreaver January 05, 2015

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Short for "be right back," aka "I don't want to fucking speak with you" which people usually say when someone they dislike start chatting with them and they want to get rid of this annoying person.
"Haaai, how r u 2day guuurlfrend?"

-"Hey I'm good, sorry I'll brb."
by KinkyxBitchx September 13, 2012

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Buckling-Restrained Brace, or a structural brace that is part of a system to keep a building up in an earthquake.
The architect likes the look of the BRB brace in the window.
by ngnr February 09, 2010

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BUMPY ROAD BONER
AS YOU DRIVE DOWN A BUMPY ROAD YOU START TO GET SOME RUBBING ACTION THUS CREATING A BRB. "MAN THIS ROAD SURE IS BUMPY IM GETTING A BRB". "THIS ROAD IS BUMPY NO BRB'S BACK THERE"
by BONHAM116 January 05, 2010

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i'll be right back keep waiting since i won't be gone for long
chill out brb (be right back) in a second
by samkes July 02, 2007

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Bath Room Break
or
Be Right Back
Morgan223: hey nice weather we are having

Sidney445: Yeah i agree with you

Morgan223: brb

Sidney445: okay
by Entering_Kip August 18, 2006

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Big Round Boobs
Wow look at her BRB's!!!
by RawrRawrRawr666 September 24, 2010

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