Top definition
An incomprehensibly crazy person.

NB: Not used to describe a spell of psychotic behavior. A shithouse mouse is permanently insane.
Used as a comparative standard, usually vis-a-vis actual insanity.

The term originated as a more mellifluous alternative to the term shithouse rat; e.g., "as crazy as a shithouse rat."
Did you see Shavonne flip out and claw the skin off Joey Bag's arm last night? I'm glad you dumped that psycho, she's crazier than a shithouse mouse!

I saw the born-again Christians picketing at the train station again yesterday, every one of them crazier'na shithouse mouse.
by pdreezy October 19, 2008
Get a shithouse mouse mug for your father Manafort.
Jul 28 Word of the Day
to sport a boner, fly the sail at full mass, rock hard, etc.
"I had a lot of cartoon characters that used to get me sexually aroused as a kid... The female reindeer from the Rudolph claymation series, when I was in preschool, I used to be bricked up watching that shit." -Jack Harlow
by real_philly February 11, 2020
Get a bricked up mug for your guy Riley.
2
A lowly rodent who, out of desperation, has learned to live alongside man by occupying one of our less-than-ideal structures, the outhouse.

Eternally mocked by the rest of the animal kingdom for it's choice of habitat, it passes through life barely noticed by man except in this phrase: "Poorer than a shithouse mouse"

Clearly indicating that the individual described does not even possess the meager funds required to reside in an outhouse.
After being denied $20 from the ATM machine for lack of funds: "Damnit, I'm poorer than a shithouse mouse"
by Digital Logic May 27, 2003
Get a Shithouse mouse mug for your coworker Günter.
3
I guess my computer has decided to stop having a "turn off" option. Well, shithouse mouse, I'll just have to let the battery run down.
by TFill January 06, 2012
Get the shithouse mouse neck gaiter and mug.