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.
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Human testicles that possess the anthrometric property such that they repeatedly strike a sex partner's posterior (donk), typically but not necessarily during doggy style sex.
Phil's donky balls were hitting me just right last night.
George could never wear boxer shorts, on account of his donky balls.