Top Definition
My own type of fail. Pronounced "Mumumumumonster FAIL Fail fail" (fading).
Guy 1: What are those scissors for?!

Guy 2: Your face!

10 minutes later
Guy1: Haha LOL! that makes sense!

Guy2: You just now realized that? *Laughs* Mumumumumonster FAIL Fail fail
by av3nger November 13, 2010
when someone fails extremely hard (see fail) this word can be used.
it is derived of the PC game Unreal Tournament, where a massive amount of consecutive killing led to a "Monsterkill!".
Dude 1: Damn, I got ditched by this chick yesterday even though I was SO sure she loved me!
Dude 2: M-M-M-MONSTERFAIL!
by I wish i was a pretty girl September 27, 2006
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