Top Definition
Ma-na-si-um (man-ney-zee-uhm)
The genital and crotch region of a male. Derived from the words Man and Gymnasium, 'Manasium' implicates that your or someone else's crotch is in actuality a place of amusement and enjoyment for the fulfillment of yourself and others.
Guy 1: "How was your date last night?"
Guy 2: "Pretty good. I showed her my Manasium and we worked up a sweat"
by -Esquire- February 17, 2010

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