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1.
An abbreviation for "Keep your shit in check", used in the form of suggestion; to be casually used during IM or emails; pronounced Kaai-sick
- Dude, you left your coat lying on the couch. I picked it up. Someone could have stolen it.

- Oh shit, thanks man

- It's alright man, KYSIC for next time
by shrey-z April 22, 2010
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