Superlative form of trashy: most trashy.(adjective)
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Use "trashiest" in a sentence
"But if it takes its content from the trashiest end of the spectrum, then it also allows it to unfold with the stately grandeur of Greek tragedy."
"Even the Ewings would likely be appalled by the shenanigans of social-climbing gays as Logo expands its trashiest franchise with The A-List: Dallas 10/9c. ..."
"Valley of the Dolls is by far the trashiest book I ever had the pleasure of reading."