Top Definition
An acronym for Monster Erection Of Hell. Basically, where you get the biggest erection of your life, and always at inopportune moments, such as during a school presentation, or during a dance with someone that you'd rather them not feel your erection, at that moment in time.
"While giving a report on the history of the Holocaust, Nate had an obvious MEOH in his pants."

by MEOH #1 September 11, 2007
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