1. Bridge.the winning of all thirteen tricks of a deal. Cf. little slam.
2. Also,grand'-slam'mer. Baseball.a home run with three runners on base.
3. Sports.the winning by a single player of several designated major championship contests in one season, as in golf or tennis.
4. any sweeping success or total victory.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.