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When someone's breath is so bad, that even after inserting a refreshing Certs Mint Candy, their breath still reeks like shit.
Kyle: Dude, your breath is rank ass nasty! You need a breath mint.
Dwayne: Braaaaa I just ate a couple of breath mints. It should smell minty fresh.
Kyle: It ain't working Braaaaaa! What kinda mint was it? A Shit Cert? Smells like someone shit in your mouth.
by Ben Dribblin July 01, 2009
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