Top Definition
A unit of measuring sex; dick-feet per minute (d-f/min) is calculated as:

D = (L * P) / T

Where L = length of the penetrating portion of the dick in feet, P = the number of thrusts, and T = the amount of time in minutes between first and last counted thrust.
"Sally and I got it on for real last night. I think we we're doing about 240 dick-feet per minute all night long."

Ken sure had enthusiasm, but his penis was so short that he could never manage respectable dick-feet per minute.
by rojodojo August 19, 2014

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