booby prize

WordReference Random House Learner's Dictionary of American English © 2025

ˈboo•by ˌprize, n. [countable]

1. a prize given as a joke to the one that comes in last in a game:
   The booby prize was actually a pair of tickets to a play.

WordReference Random House Unabridged Dictionary of American English © 2025

boo′by prize′, 

1. a prize given in good-natured ridicule to the worst player or team in a game or contest.

• 1885–90

Collins Concise English Dictionary © HarperCollins Publishers::

booby prize noun

1. a mock prize given to the person having the lowest score or giving the worst performance in a competition