Someone who says "be right back" in an instant messaging session and never returns, or returns hours/days later.
"You brb-liar! You've been gone for a week!"
"He's such a BRB liar. You won't hear from him again until Thursday"
"He's such a BRB liar. You won't hear from him again until Thursday"
by CoachW February 6, 2008
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