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A generic reference to the show CSI where someone is caught in a lie by another who is basically too smart for their own good and has way to much time on their hands.
Jim: Hey Jenny, I am really sorry to tell you "Mr. Fishy" died while you were on vacation. He was fine for a few days and then he started getting sick... we pulled for him to get better. There was nothing we could do... I am sorry.

Jenny: Um, I gave you a brand new can of fish food before I left and this hasn't even been opened! You forgot about him didn't you!

Joe: Dude, you just got CSI'd.
by Capt Nemo June 21, 2007
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