Simple past tense and past participle of buff.(verb)
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Use "buffed" in a sentence
"Only person that can really pull the sickly thin to fairly buffed is Christian Bale."
"Having recuperated from their spawn and buffed from a summer of feeding on crayfish, smallmouths kick off their annual bid to fatten up for the upcoming winter starvation and subsequent spring spawning."
"We'll never get used to the idea of buffed-to-shine fingernails."