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1.
A term used for scaleing the amount of ones crack showing when bending over, usually rated from 1 to 10 (10 being maximum crack and possibly hair/feces)
"Oh man, pull up your pants"

"Crack factor?"

"Fuck man, id say about 7"

"Oh, sorry man"

by Taffysack September 27, 2007
 
2.
1. An addictive element of something
Why are you so addicted to watching Jersey Shore? What's the crack factor?
by getnate February 16, 2012