2)Expression of disbelief, usually over something too good to be true.
Can be described as another way of saying 'get out'.
Person2: Ok NUPPP
2) Person1: I drank 6 four lokos, 24 beers and was only buzzed last night.
1. Negative, no, to convey disagreeance.
2. Gives the subject a bad characteristic, feeling or appearance.
"You're nup" - The person you are saying this to is in some way undesirable, or is saying/performing/has performed something undesirable.
"Nup. This is nup." - Use of both word types is achieved here. The first occurance (1) showing disagreeance to something, followed by (2) to show that "this" is "nup" or undesirable.