'poonornoop' is a game in which two or more people observe passers by or discuss mutual acquaintances and debate whether they would have sex with that person or not. 'Poon' and 'Noop' are codewords for 'yes' and 'no'. This is so that if the subject being judged is nearby they will not know they are being talked about. There are two levels to poonornoop, an 'honest' or 'genuine' poon, or a hypothetical (also known as a 'Narnia') poon (meaning you would not have sex with them in this reality but possibly some other dimension).
Jordan: Hey poon or noop chubby blonde chick at the coffee bar?

Danny: noop

Jordan: Are you serious? no way, that's a poon in my book.
Danny: Okay Narnia poon
by Laslo Scott December 1, 2013
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