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 -ssociated with that specified by the base noun or adjective (cheapo; pinko; sicko; weirdo; wino).
a suffix occurring in colloquial noun or adjective derivatives, usually grammatically isolated, as in address:
cheerio; kiddo; neato; righto.
forming informal and slang variants and abbreviations, esp of nouns wino, lie doggo, jacko
word origin
probably special use of oh

used to form adjectives
having the indicated characteristics: berserko/ luxo/ neato/ sicko/ wrongo
used to form nouns 2: foldo/ freako/ klutzo/ muso •this fanciful formation is increasingly current

related terms

double-o, five-o, four-o, single-o

[1960s+; fr a humorous imitation of spanish or italian words, more probably spanish because of the similar el -o pattern of coinage]

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