What is Investigating His Crime Scene?
1.
A slang term for masturbation.
Self-gratification. The act of "playing" with your genitals, for sexual excitement/pleasure; usually to orgasm.
I walked into the room and there he/she was, naked and sprawled across the bed investigating his/her crime scene.
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The psychological Fingeris the PC version of giving someone the real Finger. The recipient will only realize they have been given the Ps..