Łał!
Wow!
O ja Cię kręcę! O chuj/kurwa!
Ja jebe!

Obv last two are casual :D
Gg on taking up polish, not easy language to learn

bleddy 'ell

great googly moogly

By imitating Owen Wilson “woooowwww”

Hala! is wow in Tagalog, Filipino language

Wow! or Wahnsinn! or Krass! - German

Ay Caramba!

Ammata udu! (Ammata means “to mom”, no idea what udu means)

Vau in lithuanian :3

Leck Oasch

But that’s just the polish, phonetic way of “wow”. Like saying “uao” in norwegian. But considering that’s a foreign word our equivalent would be more like “dæven”, a soft variation of “Devil”.

Basically “What the devil?!”

Godnondeju

Wauw!

Wah

Vaŭ

In Esperanto