Simple past tense and past participle of trounce. (verb)
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Use "trounced" in a sentence
"I think you meant to say that Palin trounced Pelosi."
"One of the reasons Kaine trounced is that so much great work was done on the state voter file this year (unfortunately, all the money and focus was and sort of had to be on Kaine, so promoting and tracking Byrne and Deeds kind of got left behind)."
"Developed by Naughty Dog and published by Sony, the PS3 exclusive action title trounced the competition, taking home awards including Game of the Year and Outstanding Achievement in Game Direction."