Nipple Protrusion; when you can see an individual's erect nipples through their clothing, intentional or unintentional. Can be a result of sexual excitement/arousal or (un) favorable temperature.
Person 1: Dude, did you see that gal just walk by with all that NP?
Person 2: Yeah man, she needs to get a thicker bra or something!
laughter
1: Most commonly used as an acronym for the term 'no problem'.
2: Also can be used in the gameLeft 4 Dead in which it would stand for either no problem OR nice pounce, depending on the context of it's use.
Nigga Please also for white people negro please. Used to express disbelief in a stament or action from someone or something. Mental rejection of something as untrue.