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The length of time it takes for a man to move the tip of his penis one mile in the reference frame of the vagina while having intercourse.

The following formula can be used for a simple calculation: (63,360 inches / 2*(penile length)) * (Average thrust time), where penile length is in inches. The units of average thrust time will determine the units of the fuckmile.
Man, I was waiting at the DMV for like 3 fuckmiles yesterday.
by snmit March 02, 2009
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