A phrase used when you are done rompin the cheeks of a girl, also it can be used when you a galiantly walkin down the hall and you approve of something with great enthusiasm. People use "Ohhh Yuppp" to express a sense of accomplishment or just to piss of dumb Gwedos!! Ohhh Yuppp is a stylistic phrase that can be used in many situations.
That phrase must be used by someone with experience.
It is pronouced (ooo, yaaup)
Person 1: "dude did you romp (girl name)'s cheeks last night"
That Guy: "Ohhh Yuppp"