Top Definition
expression used to mean "I'm back" in instant messaging, usually said after "brb," once the person returns

possible origin: conjunction of expression "k back" into one word
**INSTANT MESSAGING**

Jenny: Do you want to have sex?

Johnny: brb

Jenny: Okay

*10 minutes later*

Johnny: bakk

Jenny: Cool, do you wanna have sex?
by Peter "MILF" Cameron March 08, 2008

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