idkfs 

I don't know for sure.

“When did everyone else leave?”
“Idkfs but it was sometime last night.”

idkfs by willowTM June 12, 2010

idkfa 

A cheat code in the iD Software game Doom, which gives you all the weapons in the game, as well as all the keys.

Type idkfa to stock up on those precious BFG cells!

idkfa by ChaoX December 17, 2004

idkfa 

A well-known cheat code for the computer games Doom and Doom 2. Entering the code gives the player all keys, all weapons, and full ammunition. It can be entered an unlimited number of times per level to refill ammo.

The cheat code most likely means:

id = id Software
k = keys
fa = full ammo

I can't believe they left the classic Doom cheat codes like idkfa and iddqd out of Doom 3!

idkfa by MC Mikey July 4, 2011

idkts 

I don't know this s***

When you don't know what something is. Usually said when trying to answer a quiz/test question.

*you see a test/quiz question that you don't know* Bruh, idkts, where tf did this come from.

idkts by fhk x3 February 19, 2017

IDKSAS 

I don't know shit about shit. Lacking fundamental knowledge with the discussion at hand.

When it comes to evolution idksas. Cindy didn't get the job because during the interview she confessed "idksas".

IDKSAS by DeepakSF January 7, 2015

IDKWSMDBIWTK 

This abbreviation stands for "I don't know who stole my dog but I want to know"

Bryan: I heard you lost your dog!
Me: IDKWSMDBIWTK, Bryan!

IDKWSMDBIWTK by AGuyTryingToFindWhoStoleHisDog May 28, 2017

IDKisms 

Idk-isms are the multiple millions of ways to say idk plus a few end words. many of these are listed on urban dictionary simply look up idk and you will find words like IDKAIDC meaning i dont know and i dont care or idkwtfid which means i dont know what the fuck im doing.

IDKisms

IDKisms by tflnfreak August 14, 2009