iM
Short for iMessage. Designated with a capital 'M'.

To send a message to someone via Apple devices running iOS 5 or later. It could be a message to send text, videos, locations and contacts.
"Did you get my iM?"
by @SherwinNgo October 10, 2011

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IM
noun.
1. a message that is sent over an online messaging service

verb.
2. the act of sending or receiving a message over an internet service
1. I sent an IM to Tommy to tell him about the party.

2. Eugene IM'ed me to tell me about his lame party.
by metman85 October 30, 2005

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its short for instant message.
do u have AIM (aol instant messenger) if u do why not I.M. me
by Bug March 09, 2004

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i'm
a response when you dont know what to say but you still want to respond
person 1:"I just tripped over a ketchup bottle."
person2:"i'm."
by Julien steffen December 29, 2016

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I.M
it Simply means imOut.!
As in Peace Out or Goodbye
Yeah iHad ahGood time.. TTYL.. I.M
by OCQ.Syditty August 06, 2009

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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.
by Chris B dot April 12, 2007

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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.
by thegreat_1 December 03, 2010

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IM
meaning "istant message", when someone gets an account from a "instant message" company, and add's your screename, and talks to you when theyre bored
beep!

*****:hebrew means drugs, i IMmed you

****:ok.........
by fljsjflsxfs March 03, 2006

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