Acronym for the phrase "Good Bull", which is shorter for the phrase "Good Bullshit"... because bullshit is always party-like.
"So I just solder the metal to the metal wire...", as one succeeds they exclaim,
"and good bull, good bull, gb, gb GB!"
Short for "F*ck you! :)"
An easy way for denying a request without fully hurting someone's feelings.
"Hey Daris can you do my math homework for me?"
"Q!"