Pag-chur oi
A loud and rude way to say you don't believe a word someone just said, like they told you the sky is green and you said, 'No way.'
Pag-chur oi! You're telling me you're gonna finish that homework before dinner? I'm still waiting for my breakfast.
Pag-chur oi! You think you can beat me in a video game? I've beaten that game with my eyes closed.
Pag-chur oi! You're telling me you're gonna win the contest? I got better chances of getting elected king of the classroom.