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The ability of an individual to rotate a female on an erect penis during coitus, scaled from 0 to 10.

0 = unspinnable, no rotational inertia
10 = freely spinnable, potentially reaching perpetual rotation
"bro she is fit, her spin factor is off scale!!"
by Immyrun November 07, 2016
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Jul 28 Word of the Day
to sport a boner, fly the sail at full mass, rock hard, etc.
"I had a lot of cartoon characters that used to get me sexually aroused as a kid... The female reindeer from the Rudolph claymation series, when I was in preschool, I used to be bricked up watching that shit." -Jack Harlow
by real_philly February 11, 2020
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