Top Definition
An acronym for "long time before a reply". Usually to suggest to a person that they made a fairly long pause in conversation in the event of texting or messaging.
Person 1: Hey.
An hour later...
Person 2: Hi.
Person 1: ltbr...
Person 2: Sorry, was taking a bubble bath.
Person 1: Oh, okay.
by CreeperReaperr October 13, 2011
Let
The
Beat
Rock

Most likely referring to the Black Eyed Peas song "Let the Beat Rock".
Person 1: Hey Tony, ltbr!!

Tony: Ok!! (turns on the Black Eyed Peas)
by friendless 2 April 17, 2016
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