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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Top Definition
im
1) (n.) "Instant messanger"


A programme, usually downloadable for free, that allows people to chat in real-time. Many have integrated features such as file sending, two player games, pictures and drawing boards. They are basically an evolution of electronic mail that allows people to get closer to each other. The most popular IM programmes are aim, msn messanger, yahoo IM and icq

2) To use 1) to contact another user of IM's.

3) Mis-spelling of I'm.
1) I need to get a better IM

2) IM me tonight.

3) OMG IM GAY!!!!!111!2!ONE
by Gumba Gumba February 28, 2004

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IM
Instant Message or someone who can't be bothered to use an apostraphe for "I'm" (I am).
"some weirdo just imed me"
"im so lazy, man"
by j00l.i.e April 26, 2003

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IM
n. An instant message. IM does not imply the use of either AIM or ICQ.

v. To send someone an instant message.
Did you get my IM?

My sister IMed me last night.
by The Grammar Nazi December 09, 2001

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I'm
A short version of "I am".

I'm ______.
Anything can fit in that blank.
I'm typing an example of the word "I'm" right now.
by RawrItsPanda November 12, 2009

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IM
Intramuscular, as in Instramuscular injection of a drug
"Oh shit, Danny is ODing on Heroin...let's take him to the hospital for an IM injection of Naloxone"
by WSB15 February 25, 2006

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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
Not common, but used to mean "him".
Kill'im!
by Fangsta March 17, 2003

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