1 definition by M.&M.

An IM acronym for "Cubical Intrusion." It lets the other person you're chatting with know that you've been interrupted by someone walking into your cube or personal space at work.
Me: Did you ever talk to Rob? I heard he's thinking of giving his notice on Monday

Maria: CI

Sorry, I'm back. It was that d-bag
John. He's been bugging me all
morning.
by M.&M. December 5, 2008
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