Top Definition
The final score in a game of Hearts when one person has the Queen of Spades and 12 of the 13 hearts. This score counts as 25 points against the poor schlemiel.
Maeve nailed a Junior Moon four times, thereby losing the Hearts game.
The Junior Moon is always a cause of much sneering, heckling, and ribbing.
by Cap'n Bullmoose July 31, 2008
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