When dumb person achieves what he doesn't deserve or when a deserving person fails to achieve,luck is called dumb luck
Norah:Hey, Sam should have been student of the year for his outstanding performance throughout the year.
Adam: Dumb luck!!!

Norah:How come hurt locker won Oscars?
Adam: Dumb luck!!
by Chanandler March 25, 2010
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When a person wins @ a game with dumb luck
While playing rocket league I lost to another player by dumb luck.
The rocket league player scored 4 goals in 30 seconds to win the game now that's dumb luck
via giphy
by Armandhammer October 20, 2017
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