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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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Something a girl says when she will aparently "be right back" (like 5-10 min), but really means she's ditching her friends for her boyfriend (1 hour-Forever!). At first you might believe... But after a while you will learn that "BRB" means she's not coming back.
If your good friend starts saying this beware... Your friend time with her is limited!
Girl: "Brb" guys!

Friends: "Okay see you tomorrow"

Girl: "No really, I'm coming back!" (leaves)

Friends: "Let's bet on it... 20 says she's not"

2 Hours later...

Friend: "Pay up!"
by Albino2.0 April 09, 2010
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30
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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31
This term is commonly misunderstood as "Be Right Back" where one individual in an online conversation has to leave for a certain amount of time during a good conversation.

This is actually wrong though, it has a very firm meaning of "Bringing Ryne Beer" and often times is heard daily.
Person #1: "So whats up?"
Person #2: "Hold on, BRB"
Person #1: "Isn't that his 4th beer today?"
Person #2: "Yes - hold on, you know he gets cranky if I don't bring it right away"
by Joseph Blackstone February 16, 2009
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32
Be Right Back.

You are online and someone sends you a IM but you dont want to talk. You say BRB, never reply again, eventually logout.
Person 1: yo lets play ball

Person 2: nahh

Person 1:WHY NOT

Person 2:...

Person 2: BRB

Person 1: ok

---30 minutes later---

Person 1: you playing or what?

---1 hour later---

Person 1: fuck this

Person 1 is offline.
by AssViolater September 10, 2010
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33
'Net chat slang, or "netiquette" for "be right back." The term does not, however, actually mean, "be right back." It is a segue euphemism for "get lost," "f*ck off," "I'm not interested in you," "never in a million years, you troll," etc. Used mainly in dating or sexually oriented chat.
Sure, I would love to meet up sometime. brb
by A. Hick November 05, 2006
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34
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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