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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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Sep 6 Word of the Day
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Damn that was a steezy ass kickflip son!
by niggaliciouszor April 29, 2007
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