Green’s Dictionary of Slang

oddball adj.

peculiar.

1956		H. Gold Man Who Was Not With It (1965) 196: All those oddball buddies.
1963		H.S. Thompson letter 1 Jan. in Proud Highway (1997) 365: I don’t have much time for the oddball stuff that is really the most important.
1978		F. Norman Dead Butler Caper 14: Oddball punters got through to me at least twice a week.
1987		M. Bail Holden’s Performance (1989) 316: The Australian love for the oddball-character has bedevilled the newspapers, its art and literature.
1991		B. Hamper Rivethead (1992) 3: If Hank had left it at that, he’d have hardly qualified as bein’ remotely oddball.
2000		T. Blacker Kill Your Darlings 185: I found myself wondering now how it was that the Gibsons, with their oddball son, managed to achieve that ease and intimacy while Marigold and I, with our oddball son, had merely conjured up a chilly wasteland of hostility and non-communication.