I.M 

maknae of the South Korean boy band Monsta X.

Girl 1: Who is your ultimate bias?
Girl 2: I.M of Monsta X!

I.M by esse1hunnit November 28, 2018

I.M 

Member of monsta X

Also known as daddy, he’s a snacc, a full course meal, and such a talented little bitch it makes me mad, Stan Monsta X you cowards

“wow, I.M is perfection”
“Holy crap I.M can get it”

I.M by XxNoel August 4, 2019

I.M. 

its short for instant message.

do u have AIM (aol instant messenger) if u do why not I.M. me

I.M. by Bug March 9, 2004

I.M 

it Simply means imOut.!
As in Peace Out or Goodbye

Yeah iHad ahGood time.. TTYL.. I.M

I.M by OCQ.Syditty August 6, 2009

i m 

Short for "immature." To be used when you don't want to say the word "immature" because saying the word itself when refering to someone is in itself immature.

Am I going out with that girl from the bar again tonight? Hell no son, she was way i m. Only like 21 or some shit.

i m by Chris B dot April 20, 2007

i.m 

Shortened version of saying "I mean"

"Yeah i.m she's not that bad looking ig"

i.m by Take some chill pills August 14, 2017

I'm 

A way of insulting an idiot, by sarcastically claiming to be them. Simply say "I'm.." and then say their name.

Jacob: *farts on a cute girl*
Tony: I'm jacob.

I'm by thegreat_1 December 4, 2010