stink like a polecat

Due to the European polecat ejecting a foul-smelling secretion.

stink like a polecat (third-person singular simple present stinks like a polecat, present participle stinking like a polecat, simple past stank like a polecat, past participle stunk like a polecat)

1. (simile, slang, derogatory) To have a bad smell, mostly referring to human body odor.