From Wiktionary, the free dictionary
Contraction of вишь (višʹ), in turn contraction of ви́дишь (vídišʹ).
ишь • (išʹ)
- (colloquial) see!; (just) look, listen; there; oh; now
- ишь ты! ― išʹ ty! ― how d'you like that!; oh come on!; what are you talking about!