oh yeah /oʊ jæ/ exclamation4 •(informal) Used to indicate agreement, often sarcastically.Are you going to the party? — Oh, yeah! •(informal) Used when suddenly remembering something.Oh, yeah, there was a police car outside the building for some reason. •(informal) Used to introduce a refutation, sometimes sarcastically.(In a poker game): I raise you twenty. — Oh, yeah? I think you're bluffing. I call. •(informal) An exclamation of excitement or joy.Oh, yeah, I got a new video game!