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So to bet means to gamble and a dub is a 20 dolar bill, i would think you use this word when you don't believe a person. Like if i said "i have a million dollars!" you, because you don't believe me, you would say "betdub!"
"I just bought a Escalade!"
"Betdub!"
by jenstar December 22, 2005
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Words related to betdub

no way! please sure whatever yeah right