-o

1) aff. a suffix occurring as the final element in informal shortenings of nouns (ammo; combo; promo); -o also forms nouns, usu. derogatory, for persons or things exemplifying or associated with that specified by the base noun or adjective (pinko; weirdo; wino)
2) aff. a suffix occurring in informal noun or adjective derivatives, usu. grammatically isolated, as in address:
kiddo; neato; righto[/ex]

From formal English to slang. 2014.

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