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1.Proof or evidence supporting your outlandish claims.
Origin is from the CARFAX.com commercials featuring a fox that is best known for saying, "show me the CARFAX," to unsuspecting car salesmen.

2. A list of people you've had sex with.
1. Person 1: I met Jay-Z last night!
Persion 2: Show me the carfax or it didn't happen.

2. Person 1: Person 1: So when are we gonna make it official and become a couple?
Person 2: You gotta show me the carfax before we get serious.
by SACBRUH May 04, 2013
A person's sexual history
"Hey what do you think of that girl, should i talk to her"

"I don't know dude did you check her Car Fax"

"No why?"

"She have a lot of miles"
by datboydere0028 April 28, 2010
What the fox actually says.
"What does the fox say?!"

"Show me the CarFax"
by KayM October 12, 2013