wise guy
[noun]
Synonyms: smart aleck, know-it-all, *smartass, smarty, smarty-pants, wiseacre, wisecracker, wisehead, wisenheimer

[TahlilGaran] English Synonym Dictionary ▲

wise guy INFORMAL noun [C] (US OFFENSIVE wise ass)
someone who is always trying to seem more clever than anyone else in a way that is annoying:
Okay, wise guy, if you're so damned smart, you can tell everyone how it's done!

wise-guy /ˈwaɪz.gaɪ/
adjective [before noun] (US OFFENSIVE wise-ass)
wise-guy humour

[TahlilGaran] Advanced Learner's Dictionary ▲

wise guy
[American & Australian, informal, American, very informal!]
someone who is always trying to seem more clever than everyone else in a way that is annoying.
Okay, wise guy, if you're so damned smart, you can tell everyone how it's done!

He's just some wise-ass who thinks he knows all the answers.

[TahlilGaran] English Idioms Dictionary ▲

wise-guy
[American & Australian, informal, American, very informal!]
a wise guy - someone who is always trying to seem more clever than everyone else in a way that is annoying.
Hyde's wise-guy humour loses its charm after a few episodes.
(always before noun)

[TahlilGaran] English Idioms Dictionary ▲

wise guy
a person who acts as if he were smarter than other people
He always acts like a wise guy when he is in a big group.

[TahlilGaran] English Idioms Dictionary ▲

wise guy
n. phr., informal A person who acts as if he were smarter than other people; a person who jokes or shows off too much
Bill is a wise guy and displeases others by what he says.

[TahlilGaran] English Idioms Dictionary ▲