An expression used in IM (MSN, Facebook...etc) conversations. Though technically meaning "be right back", it is more commonly used as an excuse to leave a conversation with a person you don't want to talk to anymore.
Derek: Hi what's up?
Aliesha: Nothing much really...kinda bored...and I'll BRB...

Hours later:

Derek: I thought you said you would BRB...you lied!
Aliesha: No...i didn't lie
Derek: Then why did you comment on Facebook 30 mins ago??? You were still at the computer...you didn't want to talk to me...i see how it is
by aquastar8567 October 17, 2011

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BRB is an emcee based in Canberra, Australia. Originally from New Jersey in the US. He has performed in the US, Russia, Finland and along Australia's eastern coastline with peeps like Brethren, The Truth, Winnie Coopers and Joel Turner.

He emerged in the Aussie hip hop scene in 2005 with the release of the 'We're Metaphysical' EP by his crew Metaphysical Combat. Since then BRB has branched out as a solo artist.

He is also a producer and founded an independent production company, Metaphysical Productions, in 2006.
It's the BRB smackin you like you were the fourth stooge
by MCDUST May 01, 2010

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brb is an acronym for Be Right Back.
People use it in online games and chatrooms mainly, teenagers use it when they really gotta jerk off, while younger kids use it when they must eat or they parents yell at them.
randomguy: uhm, brb!
randomgirl: leaving me? :<
randomguy: juts gon.nannfnps
randomgirl: what?
*Thypical guys when they write with one hand and having some fun with the other*

randomkid: BRB, XD
randomperson: okay, we'll wait.

*4 hours later*

randomperson2: FUCK!
randomperson: Come on guys, he'll probably be back soon, just wait plz
by gromuth November 27, 2007

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Used by Dave to say he will be back in an hour or two.
"brb"

*an hour passes*

"To HELL with your brb's, Dave >_<"
by Panich October 26, 2006

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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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An acronym some of my friends use to say "Bye"
1: brb
2: ok
.........
1 has just signed off
2: I thought so
by Felipe November 24, 2004

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Be right back
1:Hey are you coming online later
2:yeah, brb
by Ali.xoxo October 31, 2015

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