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

present participle of think one's shit doesn't stink

Third-person singular simple present indicative form of think one's shit doesn't stink

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

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

(vulgar) To be arrogant or overconfident.

Alternative form of stink a dog off a gut wagon

(idiomatic) Alternative form of up shit creek

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