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To Prematurely ejaculate on a woman who was expecting mind-blowing, eye-rolling, toe-curling sex. A word originating from the Bulawayo region of Zimbabwe named after the guy(A contraction of eMMANUel) that inflicted this travesty on the girl he had worked up into a frenzy with too much conversation that he couldn't backup even the littlest action. He claimed over excitement as his defence.
E.g. I finally gave him the time of day and the jerk pulled a mmanu on me.

It can also be used as a verb. To ejaculate in a stupid way
Pulling a mmanu on a horny woman is cruel and unusual punishment.
We tried to have funch and he mmanued all over my skirt.
by Zimbo-rita March 05, 2015
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