Top Definition
The act of someone, in most cases female, seeking to see if a man is lying or already in a relationship by asking several questions of the CSI-ee and friends, looking around the apartment/house and/or online for clues like a Crime Scene Investigator.
Leah noticed a bra in a man's bathroom, dishware for two, and a photo collage of a girl in the guy's place where she has visited for the first time.

"The second she entered the house, she began CSI'ing the place."
by BluePumpkin May 20, 2009
5 Words related to CSI'ing
When you really wanna blaze, but you have to do it outside, after a snowfall. The snow shows where you go, where you blaze (ash, roaches, etc.) and then heading home. Making easy evidence for a cop.
It's so sketch to go CSI-ing, cops could bust us so easily!
by randomkyle December 19, 2008

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