Simple past tense and past participle of party.(verb)
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Use "partied" in a sentence
"When they woke him up to watch over their newest prey — a bald, intense boxer who they left tied up while they "partied" with his gangster buddy, he was no longer "Johnny Lawrence" or "Greg Tolan" or even "Chaz"."
"She kind of partied it up but not to the extent that I did in college."
"Stayed with a friend in Keelung and "partied" there in a music bar on Wednesday night in what must surely be the deadest large city on the whole island: on Wednesday night the bars were mostly closed."