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1.
ICR
I couldn't/can't remember.

Internet slang, usually a past tense for idr which is "I don't remember."
Person 1: What's your favorite song? someone asked me yesterday and icr!!

Person 2: It's "Its Just Me" by ETF
by Ninja Emmett January 07, 2010
 
2.
icr
ICR means I Can Relate. Internet slang.
Jess: I hate men.
Eve: ICR! My bf has been screwing around, fuck him.
by shanice89 October 31, 2007
 
3.
I Can't Remember Shit
Yo I've got a bad case of ICRS after the party last night.
by danl1 June 17, 2011