Definition of wise-ass in US English:

wise-ass

noun

North American
informal
  • A person who is irritating because they behave as if they know everything.

    ‘he is such a sarcastic wise-ass’

adjective

North American
informal
  • Irritatingly clever or smug.

    ‘wise-ass one-liners’

Pronunciation

wise-ass

/ˈwaɪzˌæs//ˈwīzˌas/