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smarty-pants

[smahr-tee-pants]
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noun (used with a singular verb)
  1. smarty.
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Origin of smarty-pants

First recorded in 1915–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for smarty-pants

smarty-pants

smarty-boots (ˈsmɑːtɪˌbuːts)

noun
  1. (functioning as singular) informal a would-be clever person
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012