smarty-pants
noun
\ ˈsmär-tē-ˌpan(t)s
\
\
plural smarty-pants
Definition of smarty-pants
informal
: smart aleck, know-it-all
"If you give people the impression you're a smarty-pants, that's no good for sure."— Al Gore Choosing books for picky friends can be humbling. There's always one smarty-pants who has read not only the gift book but everything else in the author's oeuvre.— Marilyn Stasio Even the smartest of smarty-pants couldn't have answered all four of those "gotcha" foreign-policy questions.— Jonathan Alter
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More Definitions for smarty-pants
smarty-pants
noun
English Language Learners Definition of smarty-pants
informal + disapproving
: a person who talks and behaves like someone who knows everything
See the full definition for smarty-pants in the English Language Learners Dictionary