Etymology
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smart aleck (n.)

1865, of unknown origin, perhaps in reference to Aleck Hoag, notorious pimp, thief, and confidence man in New York City in early 1840s [Barnhart]. See smart (adj.). Related: Smart-alecky.

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Definitions of smart aleck

smart aleck (n.)
an upstart who makes conceited, sardonic, insolent comments;
Synonyms: wise guy / wiseacre / wisenheimer / weisenheimer
From wordnet.princeton.edu