Potluck Share definition Flag A word said aloud by any member of a group to indicate something worthy of a food-consuming party has transpired. "My sister finally had the baby!" "POTLUCK!" "My roommate found $100!" "POTLUCK!" "I got a promotion at work!" "POTLUCK!" Potluck by potlucky September 19, 2011 Get the Potluck mug.