Top Definition
inch minutes, n. inches per minute. A measurement of penis fed during a sexual encounter per minute. Inch minutes are a more accurate way of determining the efficiency of a penis.
For example, if John has a 5" penis, and thrusts 30 times a minute, he is giving 150 inch minutes. If Bill has a 10" penis and thrusts 10 times a minute, he is only giving 100 inch minutes.

"I diligently provided your mother with 200 dedicated inch minutes last night and she enjoyed it immensely."
by Initial Ed February 18, 2009
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