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Abbrievation for "Can't Talk Right Now" - commonly used online, like when someone is trying to IM you and you're really busy.

Or if you just don't like them, and are pretending to be really busy.
summer_girl19: Omg, you will NEVER believe what happened last night between me and Michael!

iluvorli_78: Ctrn - working on English paper.

summer_girl19: Ok, bye!
by Leolani June 19, 2004
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