simple past tense and past participle of think one's shit doesn't stink

(idiomatic, vulgar, derogatory) Everything someone uses or does fails or becomes worse.

Synonym of don't shit where you eat

(vulgar) To be bewildered, especially about what future course of action one should take.

Alternative form of stink a dog off a gut wagon

(idiomatic) Alternative form of up shit creek

(vulgar) To be arrogant or overconfident.

(idiomatic, vulgar) One should not cause trouble in a place, group, or situation in which one regularly finds oneself, as it will likely backfire

(idiomatic) Alternative form of up shit creek