1. three simple letters that, together, they form a word meaning 'i don't know' in aim lingo. typing 'idk' instead of 'i don't know' is much faster and easier.

2. this word/combination of letters is most commonly found in the same phrase as, "idk, my bff jill?" this phrase is found in those texting commercials.
1. emmy: soo what do you wanna do today?
mary: umm, idk.

2. emmy: who stole my cookies?!
mary: idk, my bff jill
emmy: oh.
by ~lexii~ July 04, 2008
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1) An abbriviation of "I don't know"

2) A term used by all the hip and with-it optometrists in the context of the severely visually impaired
1) "Hey are you gonna be able to go to that thing at that date and time upon which we agreed earlier?"
"Idk... maybe."

2) "Yo Thompson, check out this fool here, he's got some legit idk creepin in."

"Thas wack, brotha."
by Teh K March 01, 2010
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Idk stands for I don't know. It's pretty simple actually. Nothing more to it than that.

Emma: What time do we have to hand in our homework?
Lola: Idk

Rachel: Who is she?
Samantha: Idk
by idk_definitions February 07, 2018
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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
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