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9.
nm
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 01, 2009
 
1.
nm
Quite Possibly the most useless internet/chat abbreviation known to man. 'nm' can be short for one of two things, 'Never mind' and 'Nothing much'.
Commonly misinterpreted by users, the abbreviation can be harmful, even fatal.
'Hey fag! You best not have spent all my money. What did you spend it on?'
'nm'
'Well I do fucking mind you worthless shit! It’s my bling! Ima come around and cut your balls off and put them in your mouth!'

The previous was a common occurrence where Person B merely stated that he had not wasted much Person A's money, however, he got dead because he used the vague term, 'nm'.
by J-Dogg January 30, 2005
 
2.
nm
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 05, 2002
 
3.
nm
perfect way of killing a conversation.
hey
hi
whatsup?
nm.
by meg4tr0n May 18, 2008
 
4.
nm
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
 
5.
nm
"Nothing Much"
A:Hey
B:Hey
A:What's Up?
B:NM, you?
by Wild January 11, 2004
 
6.
nm
in the subject line of an e-mail, (nm) stands for no message. that is, the sender is so to the point that he needed only the subject line to express himself, so there's no need for the reader to open the (blank) message.
Subejct: Your house is on fire. Run for cover. (nm)
by Zen06 June 19, 2005
 
7.
nm
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