-o

-o

1.
a suffix occurring as the final element in informal shortenings of nouns (ammo; combo; condo; limo; promo ); -o, also forms nouns, usually derogatory, for persons or things exemplifying or associated with that specified by the base noun or adjective (cheapo; pinko; sicko; weirdo; wino ).
2.
a suffix occurring in colloquial noun or adjective derivatives, usually grammatically isolated, as in address: cheerio; kiddo; neato; righto.

Origin:
perhaps orig. the interjection O, appended to words as in def 2; as a derivational suffix reinforced by clipped forms of words with -o- as a linking element (e.g., photo, stereo), by Rom nouns ending in o, and by personal nouns such as bimbo and bozo, of obscure origin

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-o
 
suffix
forming informal and slang variants and abbreviations, esp of nouns: wino; lie doggo; Jacko
 
[probably special use of oh]

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