smarty-pants

smarty–pants

noun plural

Definition of SMARTY-PANTS

a person who likes to show off in a clever but annoying way <I don't need to hear from some smarty-pants second-guesser that the theme for the party is all wrong>

Synonyms smarty (or smartie), smarty-pants, wiseacre, wiseass, wise guy, wisenheimer (also weisenheimer)

Related Words know-all [chiefly British], know-it-all; wisecracker; hotshot, show-off