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The extra flap of skin that resides on the taint side of the butthole. It aids in stretch, so that the butthole can pass stool and accept foreign objects. Sometimes this is referred to as a butt clit.
I licked Johnnie's butthole yesterday and got his filbin stuck between my front teeth.

Dang, Kendra's filbin is bigger than my dick!
by nff123 August 01, 2011
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Aug 7 Word of the Day
A celebrity free pass is an agreement between you and your significant other that if you meet said celebrity and there is an opportunity to sleep with them, your partner cannot get mad at you for doing so because you had agreed before hand that this person was your celebrity free pass. It is ideal if both of you in the relationship choose a celebrity free pass so that the playing field is even.
Julia met Drake at a bar, and hooked up with him, knowing that her significant other could not be mad at her, because Drake was her celebrity free pass.
by gingerale011 March 25, 2011
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