THESAURUS
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