Top definition
Unintentional Masturbational Explosion.

A not uncommon phenomina, where during masturbation, the ejaculation occurs in an unintended fashion, and the 'man juice' spurts out in an explosion-like manner, splattering everywhere, including undesirable places i.e. desk, keyboard, face
I was having a wank last night when I had a UME, it went all over the computer!
by DudeyMcCool September 17, 2009
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2
Totally and utterly cool
I am ume riding on this girl
by mike simpson May 12, 2003
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