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13.
jm
pronounced Jii-Emm, but doesnt mean the same thing
dude, mate, etc
a name you call your friend when you greet them or bid them farewell
Guy1: Hey! Whats up JM?
Guy2: Hey JM, nothing new.

or

Chick1: I gotta go
Chick2: See ya JM!
by KatnuttKATASTROPHE January 04, 2009
 
1.
jm
Aim shortcut to say just messin'. see jk
johnny: you're gay
joe: :(
johnny:jm
by John Pinkerton December 08, 2005
 
2.
JM
jelous much?
Speaker 1 : ugly jeans
Speaker 2 JM
by LipGlass June 09, 2009
 
3.
jm
short for just messing, successor to jk (just kidding) and jp (just playing)
Boy A: Man I don't know how to tell you this but I assfucked your mom last nite. jm
Boy B: I'm gonna shank you...
by c11234 November 30, 2005
 
4.
jm
used on teh internet for "j00r mum"

13370R way of saying ym
omfg jm r 73# u83r 6#3y + j00 oh noes it! OmFgRoFl!
by 8u7r0n r 73# 6#3y mi7 di3 \/( November 22, 2004
 
5.
JM
An acronym for the word Jerk Move. See Jerk move.
Ughh...Mark is so dumb, he just pulled a JM on me.
by Kagebunshin March 06, 2009
 
6.
JM
N.

An entity or group of individuals that slay pussy at parties and have sex with many women (notorious in New York City)
On New Years, JM got with 18 girls combined.
by Suavvay May 26, 2010
 
7.
JM
To be defensive overly so, and to never admit one was mistaken
My Friend Josh was being so JM the other day, what a dumbass...
Stop being so JM, it was just a joke
by Raypture June 27, 2009