ISR
In School Restriction. This is when you are held in a classroom apart from other students for one class period. Your teacher will often send work for you to do. Like ISS but not for as long of a time.
My friend had ISR during math because he was playing on his iPod yesterday.
by CatChick February 17, 2010
ISR
Illegal Street Racing
"yo, you cats down for some ISR?"
by Rich B August 30, 2006
ISR
Girl and boy school located in Monterrey, Mexico. Boys show their boxers and more; since they like the feeling of the air through their ass. Girls use slutty short skirts while pretending to be holy and spoiled daddy's little girl.
Boy: Woah, nice skirt! I wonder what's underneath it babe
Girl: Well, keep wondering becuase you're never gonna know asshole.
Boy: Damn, I sure as hell want that bitch
Boy 2: Well man, keep dreaming because she's from ISR
by NILS321 June 13, 2011

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