Not Much. Mostly used on im (instant messaging) e.g msn, aim, skype.
fred: Heyy up to much?
Tim: nm you?
fred: nm just chatting to you
Tim: oh cool
by MsnAddict_x May 1, 2009
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an annoying/lazy way of saying "Oh, I was just sitting here with my thumb up my ass, waiting for you to ask me what I was doing. In fact, let's just stand here and piss away 3 minutes of our lives talking in unclear ambiguous terms about how our day is, what we did five minutes ago, and what we plan on doing five minutes from now."
Person 1: Whazzzz up??
Person 2: nm
by Anonymous November 5, 2002
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An abbreviation of "not much" or "nothing much". It is most commonly used in instant messaging conversations as an easy and thoughtless answer to the question what's up.

Some people also use it as an abbreviation for "nevermind", but "nvm" is more popular.
Typical start of an MSN conversation:
Jack: hey
Jill: hey
Jack: sup?
Jill: nm u?
Jack: nm
Jill: cool
Jack: yup
Jack: (starts talking about something)
by Laurenn August 29, 2007
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nm is a messenger term that can mean 3 things
1. nothing much
2. never mind
3. no message (comment)

you must be careful that the other person knows what it means.
(a) ello
(b) hi
(a) wuu2
(b) nm u?
by mozfoz May 20, 2006
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A:Hey
B:Hey
A:What's Up?
B:NM, you?
by Wild January 11, 2004
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not much. shortened version of not much. used on msn, etc for lazy people who cant be arsed to type the full word.
"hey billy wat up?"
"nm, u?"
by hello-ther-sailor!! November 26, 2006
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