When someone "brb"s but doesn't tell the other person, usually on the computer.
Guy 1:Hey, did you see that new movie?
(Five minutes later)
Guy 1: you ninja brb'd on me, didn't you?
by Lateon September 03, 2009
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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."
by inkdrinker November 27, 2005
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A variation of the classic "brb", meant to imply that you will be back after answering nature's call.
Marcus221 says: brb bio

Legendsword says: #1 or #2???

Marcus221 says: we'll see! ;)
by josh_or_socko September 10, 2008
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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"
by unajunga December 30, 2013
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Internet slang for "Be right back, biology break," in which "biology break" refers to going to the bathroom.
by eric osgood is a huge n00b August 10, 2008
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Sarcastic expression usually used after someone links to pics involving NSFW activities. Commonly seen on vulgar IRC channels, forums, WoW perverts. BRB FAPPING stands for "Be right back, masturbating"
<MEGANOMA> hey dude, look at these pics.
<macondo> BRB FAPPING
by nalita June 30, 2008
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