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1.
The linear deliniation which defines the appropriateness of the age difference between a male and female in a relationship.

Half the males age + 7 = Creep Line. If it equals more = ok, less = creep
"Matty smutted Lasqueesha last night at the bar. He's 30 and she's only 21, that's totes below the Creep Line dude"

Matty: Dude, hit that ass up!
Tim: No way man, she's like 16, totally below the Creep Line!
by Teapotz April 26, 2012