Party animal
American SlangDefinition
An energetic, sociable person who frequently seeks out and thrives at parties, often drinking and staying out late.
Examples
"Even after a full workweek, she's a total party animal, closing down clubs and making friends with everyone she meets."
"We knew he'd be the last to leave—he's the party animal who keeps the dance floor packed until sunrise."
"Back in college, my roommate was such a party animal that our dorm became the go-to spot every weekend."