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A sexual history report or list. Like a car fax, the person requesting wants to know who's been in it, how many miles, the amount of front damage and all rear end collisions.
Phrase made popular by radio host Tommy Sotomayor.

"Black women, you've let too many niggas get inside ya pussy. Show me the cat fax!"
by Mr. Protocol July 04, 2013
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2
The user history of a vagina. When and with whom it was used, and any problems it may have.
GUY: Goodnight, you ready?
GIRL: Yea.
GUY: Aight, let's go. Wait, actually I don't mean to come off rude or nothing but can I see your Catfax?
by ohjustcheckin December 21, 2011
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