Simple past tense and past participle of slug. (verb)
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Use "slugged" in a sentence
"Post-debate analysis, including feedback from the Beacon-News staff and various undecided voters, suggested that Weisner and Irvin slugged it out on the economy, crime, taxes and downtown while Kifowit "rambled off" into non-priority issues such as pledging not to fire city employees who may otherwise deserve to be terminated and her city manager idea, which she now calls a city administrator after her original idea failed with the public."
"Following a walk and a double, Valentin slugged his third homer for a 5-3 lead."
"Jose Valentin slugged a solo homer in the seventh to match his career high of 28 and Carlos Lee connected on his 150th career homer in the eighth, a solo shot over the center field wall."