wise guy
US /ˈwaɪz ˌɡaɪ/
UK /ˈwaɪz ˌɡaɪ/

1.
mądrala, przemądrzalec, cwaniak
a person who is irritating because they think they know everything and try to be clever
:
•
Don't be such a wise guy, just answer the question.
Nie bądź takim mądralą, po prostu odpowiedz na pytanie.
•
He always has a sarcastic comment, a real wise guy.
Zawsze ma sarkastyczny komentarz, prawdziwy mądrala.