crime scene investigation 

The act of rumaging around in a female's trash for evidence that she is on her period.

I took a shit in this girls appartment last night. After a little crime scene investigation, I decided to bolt.

crime scene investigation by Double D Nice August 17, 2009

investigating his/her crime scene 

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.

investigating his/her crime scene by ScottyBAus March 11, 2008