Aim shortcut to say just messin'. see jk
johnny: you're gay
joe: :(
johnny:jm
by John Pinkerton December 9, 2005
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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
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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 6, 2009
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"JM motherfuckers!" from Puff Daddy's famous Outtro to Notorious BIG's "Who Shot Ya?," which, when it was (mis)interpreted by 2Pac and Suge Knight, started the East Coast/West Coast rivalry.
by Callumlikeiseeum October 7, 2010
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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 27, 2010
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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 28, 2009
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