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big deal (n.)

from 1860s as "a good deal, a large amount;" by 1878 in financial speculation, originally in California publications; see deal (n.1). As an ironic expression, popular in American English from c. 1965, perhaps a translated Yiddishism (such as a groyser kunst).

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Definitions of big deal from WordNet

big deal (n.)
an important influential person;
she's a big deal in local politics
Synonyms: big shot / big gun / big wheel / big cheese / big enchilada / big fish / head honcho
big deal (n.)
anything of great importance or consequence;
From wordnet.princeton.edu