Brb = Be right back
... = Silence

So the person who said brb... either
A) Wants you to disapear
B) Has something going on yet they dont know when they will be back
C) Something really odd is going on like if cyborg pirate ninja jesus was trying to sell them cookies
D) Adds on the ... without knowing what the damn thing means.

1)
Billybob: OMFG lost soooo much money at the dog races today.
Jimbobjoe: Well maybe you should bet on the rabbit next time! lulz
Billybob: Brb...

2)
Brandi: Hey Steve whats up!
Steve: n2m u?
Brandi: Nada brb...

brb... by Your Hero November 5, 2007

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brb kms

be right back, killing myself

The phrase is heavily sarcastic

Phoebe: Ate your leftovers, hope you don't mind.
Jeff: brb kms

brb kms by ER#0R April 2, 2016

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BRB FBI

Literally, the inkdrinker-coined "BRB FBI" stands for "be right back; federal bureau of investigation." The implication is that something one has just mentioned is illegal and that the FBI are at the door. Many variants of it are popular at YTMND.

"So how old is your girlfriend anyway?"
"Just 15. Oh shi - BRB FBI."

BRB FBI by inkdrinker November 27, 2005

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brb crying

Bastardation of "Be right back, I'm going to cry" or "Be right back, I am crying." Used when one would like to excuse his/her self because he/she is overwhelmingly sad, about to cry, or hysterically laughing. This term is used more commonly on the internet.

(Text messaging): "Dang, your breath smelled like shit today!"
"Wait.. since when?"
"about second or first period when you shoved that entire bag of croutons down your throat"
"brb crying"

brb crying by unajunga December 30, 2013

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