Top Definition
A rat that has simply set itself on fire and has run into a colony of cats to kil itself. Mousefire can also be a firey bitch woman who likes cats and will kill if is not fed chicken or is messed with.
Example for the rat:

Cat #1: "Hey is that another Mousefire running around here?"

Cat #2: "Yeah the fire on it might burn us down."

Example for the person:

"Damn your girlfriend is a Mousefire!" Bob says to Billy.

"Yeah that's why I'm afriad to break up with her," Billy says. "She might murder me!"
by Valsha April 25, 2009
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