WordNet (r) 3.0 (2006):

whoopee
    n 1: noisy and boisterous revelry

Moby Thesaurus II by Grady Ward, 1.0:

31 Moby Thesaurus words for "whoopee":
   celebration, conviviality, elation, exultation, festivity, gaiety,
   high jinks, holiday-making, hoopla, jollification, jollity,
   joviality, jubilance, jubilation, jubilee, larking, mafficking,
   merriment, merrymaking, racketing, raucous happiness, rejoicing,
   revel, reveling, revelment, revelry, revels, show of joy,
   skylarking, triumph, wassail