Etymology
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oddball (n.)

"eccentric or unconventional person," 1948, American English colloquial, from odd + ball (n.1). Earlier (1946) as an adjective, used by aviators. The phrase appears earlier in descriptions of modified pin-ball type games (1937) as an extra ball to be played as a bonus.

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Definitions of oddball

oddball (n.)
a person with an unusual or odd personality;
Synonyms: eccentric / eccentric person / flake / geek
From wordnet.princeton.edu