know one's shit | Idiomator

Meaning: (slang,vulgar,idiomatic)Synonym ofknow one's stuff, to beknowledgeableabout asubjectortask.Joe reallyknows his shitwhen it comes to plumbing.2005, Mike Tucker,Among Warriors in Iraq,→ISBN:"He reallyknows his shit. He knows more about guerrilla war than I could ever learn in ten lifetimes," Morales said.2011,Lev Grossman,The Magician King,→ISBN,page134:“Any magician can ask another magician of equal or lower level to demonstrate the test corresponding to their level or any of the levels below that,” she recited. “To prove theyknow their shit.”2014,Dalton Fury,Full Assault Mode: A Delta Force Novel‎[1],→ISBN:Sheknew her shit. . . . Without as much as a single stutter or misstep, she spoke about decisive point, synergistic execution, momentum shift, kinetic solution, and competent authority.

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