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from mid-19c. in poker or business; as an ironic expression, popular in American English from c.1965, perhaps a translated Yiddishism (cf. a groyser kunst).
: a big-deal salary/ a big-deal Boston wiseass dick;noun phrase
[1940s+ Students and WWII armed forces; probably fr the Yiddish sarcastic dismissal agroyser kunst, ''some big art,'' as translated and used, for example, by the comedian Arnold Stang]