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Something or someone that would live in a port-a-potty or an outhouse,Freaky,Gross
That bitch is uglier than a shit house rat
Shes crazier than a shit house rat
by hardrider93 July 22, 2009
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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.
by Treasur-Ess September 07, 2016
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