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A misspelling of the exclamation, "Nooooo". This word is often seen in the chat channel of an online game, where the speaker mistakenly hits the M and N keys simultaneously (which are next to each other in the common QWERTY layout) in the spelling of "Nooooo".

It is sometimes used as a taunt at LAN parties
>UberGamer smacked down LamerBob with the Rocket Launcher.

>UberGamer captures the flag!

>UberGamer: "pwned"

>LamerBob: "mnoooooooooo"
by Crash24 November 29, 2003
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