When you are too lazy to type " I don't know " . So you use idk .
Somebody : What are you doing ?
Me: Idk
idk is the shortened version of I Don't Know. You can ask "what does idk and idc mean" to either get an answer or I dont know and i dont care.
"What word is this definition about?"
"idk"
i like dick kock the L is silent
ex:idk probably tomorrow you:WHAT I DID NOT NEED TO KNOW THAT!