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The quality of being believable or trustworthy.
Bob: I'm up for the job boss.

Boss: Are you sure? We need someone with credibility.
by LoveBee August 21, 2008
to carefully head butt someone for good luck before you enter an exam room. Credibility gives you the power to overcome anything, like some sort of telepathic beautiful creature.
Tom: Robin, give me some credibility!
Robin : Credibility
by Tomneedsapish November 27, 2008