big time

from WordNet (r) 3.0 (2006)

big time
    n 1: the highest level of an occupation (especially in
         entertainment)

from Moby Thesaurus II by Grady Ward, 1.0

39 Moby Thesaurus words for "big time":
      action, ball, big, big-league, big-name, bigwig, bigwigged,
      consequential, considerable, double-barreled, earthshaking, fun,
      fun and games, funmaking, game, good time, grand, great, great fun,
      heavyweight, high old time, high time, high-powered, important,
      laughs, lovely time, major, material, momentous, name, picnic,
      play, pleasant time, self-important, significant, sport,
      substantial, superior, world-shaking