I dont know. Usually used to show you dont understand some thing.

Used in the examples below:
Izzy: Mate
Emma: Yh
Izzy: Whats 4x4?
Emma: IDK?
by emotionalemma July 15, 2009
An abbreviation commonly used for the word I don't know. It is used online by many people in programs such as AIM or MSN to save time.
Also made famous by the commercial "idk my bff gill?"
So0 SaRaH sAiD (12:41:34 AM): i was supposed 2 go online and figure out how i find out how many texts ive sent this month '
Fangzhou14 (12:41:45 AM): oh.... lol
So0 SaRaH sAiD (12:41:49 AM): but idk how
Fangzhou14 (11:35:15 PM): that's the 187th time you said idk.
by Fangzhou June 25, 2007
I don't know
(a word that is used too much on AIM or text)
p.s. sarah i think the count is about 187 right now
Who are you texting?
by Fangzhou June 25, 2007
Back the fuck up i don't know.
Teacher ask: Who invented post-it notes, Amanda?
Amanda says: Man, idk the answer. Who do i look like? Albert Einstein?
Teacher says: No.
Amanda says: So IDK. Idiot.
by whatever.suckit March 23, 2009
Insant Messenger acronym:
"I Don`t Know"

Usually used by people who use IM for the same exact 15 minutes every day.

This one is so rare I sometimes gotta stop and think what it means.
FuppleRampays is no longer idle at 3:10
FuppleRampays:uhh yo
PoposeMadger:when is 8or`s party?
PoposeMadger:wtf dude
PoposeMadger:I DONT KNOW!!
FuppleRampays:...there you go finally
PoposeMadger:wait what....
PoposeMadger:o yeh rite I was just fuckin with you
PoposeMadger:thats all
FuppleRampays has signed off at 3:25
by tanukisanyo May 20, 2005
you are unsure in thoughts semi-confused
"idk what to do, i am confused in what i should be doing next or even at the moment"
by viicctoriiaa November 17, 2006
i dont know - to annoy many, idk how i do that...

so idk blah night i finaly got some sleep

A word that is a GREAT PAIN to many in AASF....

it must be dealt with, with the utmost care *FRAG OUT!*
by (-SF-)GhostRider December 27, 2005

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