To engage in a very lively, raucous celebration. I've been busting my hump all week studying for my exams on Friday, so I'm going to party hearty after they're all done!I know she partied hearty on Sunday for her birthday, so she might not be in the best form this morning.
party hearty
and party down
in. to have a great time; to celebrate. (Also as an exclamation: Party down!) The whole class decided to celebrate and party hearty. Let’s party down, dudes!