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1.
gjb
Good joke bro

Used when someone says something absurd.
gjb
by waywithwords011 August 18, 2010
 
2.
gjb
An acronym for "good job, babe" used if you frequently need to compliment a significant other on IM, email, or SMS TXT messaging.
Girlfriend: I just finished cleaning your entire house.
You: gjb
by JayPeeKY April 10, 2007