Answer: whoopitup

AnswerCrossword Clue
WHOOPITUPCelebrate in a big way
WHOOPITUPCelebrate noisily
WHOOPITUPGo on a spree
WHOOPITUPCheer noisily
WHOOPITUPHave a ball!
WHOOPITUPHave a blast!