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A not-yet popular acronym for the phrase "In case you didn't know". Is sometimes confused for trying to say "Icy Dick"
Me: So ICYDK I am totally tired
Idiot guy: What?!?! Icy dick? Grooss, man!
Me: Go fuck yourself
Idiot guy: I already am *wink*
icydk by Sue Pirnova May 15, 2008
Acronym for "in case you didn't know", used when trying to keep long winded posts in internet forums and chat rooms brief.
INCYDK, I am so tired today because I was on the internet all night long.
ICYDK by I:A:N May 1, 2005

IcedKnife 

A man that never reply on twitter.
oh noooooo hes an icedknife
IcedKnife by Say heyyyyyyy April 26, 2022
in case you didn't notice
Karlie: Can you believe Jainey fucked Thomas?!
Shanaynay: Omgz like totally!! Hez so hawt!
Karlie: uh wtf
Shanaynay: jk icudn..
icudn by slimshadyd September 25, 2011
I certainly don't know
ICDK where you're going!
ICDK by SilverFlame November 13, 2016

iCuddleOlivia 

they are THE funniest person ive ever met !
Ex : iCuddleOlivia is the funniest person.