[Friends who know hiphop and black grammar come in to ask the explanation of some nouns. ]

Nigga = nigger means nigger. This is a friendly term between blacks and blacks. If people of other races use this word in front of blacks, it is very impolite and racist.

Bouncin, this word has never been heard. If you mean bouncing, you are the bodyguard and spectator of the nightclub.

What do you mean? See you later! This is a word only used by people (especially black people) in new york, USA. Only when you hear someone using "ya" to address someone, that person must be from new york (in the United States, except new york, using this word may be ridiculed).