smart alec
noun/ˈsmɑːt ælɪk/
/ˈsmɑːrt ælɪk/
(British English) (North American English usually smart aleck)
(also smarty-pants)
(also British English, offensive smart-arse)
(also North American English, offensive smart-ass)
(informal, disapproving)- a person who thinks they are very clever and likes to show people this in an annoying wayWord Originmid 19th cent.: from smart + Alec, diminutive of the given name Alexander.
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smart alec