crazy as a shithouse rat
Wildly, frantically insane
Crazy as a shithouse rat describes someone wildly erratic, irrational, or mentally unhinged.
The image is of a rat trapped in an outhouse—frantic, unpredictable, and thriving in filth.
The phrase is emphatic and vulgar, used when ordinary *crazy* won't suffice: Don't trust him with the money—he's crazy as a shithouse rat.
- mad as a hatterCompletely, absurdly insane
- delusionalHolding false beliefs firmly
- out of one's mindMentally unhinged
- over the topExcessively theatrical or extreme
- mad as a March hareWildly irrational, eccentrically crazy
stark raving mad · off one's rocker · off the deep end · unhinged · manic · psychotic · erratic · lost the plot · neurotic · bats in the belfry · paranoid · out to lunch · three fries short of a Happy Meal · nutty as a fruitcake · unstable · cuckoo for Cocoa Puffs · impulsive · irrational
crazy as a shithouse ratsane
Mentally healthy, clearheaded
rational · of sound mind · level-headed · in one's right mind · sensible
crazy as a shithouse ratcool as a cucumber
Extremely calm and composed
calm and collected · unflappable · steady as a rock · composed · even-keeled
crazy, crazier, craziest, crazily, craziness, craze, crazed, shithouse, shit