A term that refers to a cat, based on cats being known as a mouse's natural predator. Name for cats that imply that they are the bane of a mouse's existence.
Friend: "oh I see you have a cat. i bet he's good at catching them mice huh?"
Owner: "oh yes, he's a very good little demouser."
Owner: "oh yes, he's a very good little demouser."
by BioHaz8888 October 16, 2019
When you go into a public computer lab or library and every mouse you find has been ruined in one way or another. they could be smashed, have the chord removed, or have the track ball removed if the mouse is like 100 years old.
"WTF is this shit? This entire place has been demoused. People demousing these kind of places. just cause their parents are poor and cracked out on drugs all the time, and have half a brain"
by totallynotchris May 5, 2010