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Shithouse Rat 

The saying "He is as cunning as a Shithouse Rat" is used to refer to someone who is expertly sly and/or sneaky. A shithouse rat being of a lower class than even a regular lowly rat, makes this form of cunning even more underhanded.

This term does not refer to anyone's "mental state".
Don't take your eye off him for a second! He's as cunning as a Shithouse Rat.
Shithouse Rat by Treasur-Ess September 7, 2016

crazy as a shithouse rat 

Deranged, demented behavior that others deem similar to that of a rodent that dwells in a wood shithouse.
He's crazy as a shithouse rat! If his toes slip off that steering wheel that car's gonna roll.

crazier than a shithouse rat 

Insane, disturbed, having no control over one's actions.
That guy wearing the ski parka in August, he's crazier than a shithouse rat, keep away from him.

eyes like a shithouse rat 

A person with exceptional observational skills, as in being able to spot items in complex or busy environments.
That lads got "eyes like a shithouse rat"

crazier than a rat trapped in a tin shithouse 

Phrase old fuckers used to use to describe really fucked-up seemingly normal people. All bets are off in this situation because now this means the batshit crazy person loses their shit pretty fast and wants to fuck someone up real bad. My advice: run. The short modern version is: crazier than a shithouse rat. The clean version is: crazier than a rat trapped in a tin hen-house, but dont' even use this version around more than three women who are over 30 or they will fold their arms, lower their head a little while glaring at you --like you just offended their pussies.
That Jenkins is "crazier than a rat trapped in a tin shithouse"

Shit House Rat

It doesn't get any worse then this!
Shit House Rat by Phat Boys April 2, 2004
More from Urban Dictionary
A girl who does ballet and only talks about ballet. Her schedule is filled with dance classes which does not allow her to do any other activity.
"Hey, do you know that girl Sally?"

"Yeah, she's kind of annoying. All she ever talks about it ballet."

"Wow, what a Bunhead."

"Hey Sally, you want to hang out this weekend?"
"I can't, I have dance."
"You're such a Bunhead."

"Yeah... I know."
Bunhead by Jen00 October 24, 2014
Word of the Day on October 6, 2026

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026

Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Pee Calculus by anorlondo October 1, 2026
Word of the Day on October 2, 2026
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