Como dizer "ó" em inglês

In Portuguese, we use a expression when we want that the people who is hering us, pay more atencion in what we are saying or when we are showing something to someone. That's: Ó!!!!

Ex:
Speaker 1: "Voce tá vendo, ó!!!!???"
Speaker 2: "Não"
Speaker 1:" Ó, então vou te mostrar!!!!!"

That's very coloquial, but if someone know something like "Ó" in English, please answear me!!!!

Thanks!!!!