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."
6👍 1👎
after watching too many episodes of C.S.I., you start thinking that you are a "CSI" when things go weird thus you investigate or start "CSI'ING" what you don't now or understand.
man, my lighter is missing, I know one of y'all took it, 'm gonna be CSI'ING the shit outa this place till I find it yo!