Top Definition
"Nuh Muh" was created by mistake, when a girl named Faye found it difficult to do the rock on sign using her index and little finger, instead using the thumb and little finger. As rock on is written online as "\m/", the extra finger on her hand gave rise to "\nm/", from which were derived the sounds of "nuh" and "muh", repectively, giving the hand action a name.

Instead of being used as a direct substitute for rock on, "Nuh Muh" has been transfigured into meaning that something is "cool", in the sense that it is good, or noteworthy.

A colloquialism only used by a handful of people, "Nuh Muh" is set to take the world by storm, and soon, nations will be using it to describe how brilliant things are. I hope.

Nuh Muh can also be shortened to the following:
- Nuhmuh/nuhmuh
- \nm/
- NM (nm is commonly misused as "Never Mind" in online acronyms, but it *should* be nvm)
"Wow, that film was totally Nuh Muh!"

"Dude, that is so *not* Nuh Muh. That's crap as."
by Antony Willis November 22, 2005

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