Wikipedia defines hip hop like this:
Hip hop music, also called hip-hop,[1][2] rap music[2][3][4] or hip-hop music,[2][5] is a music genre consisting of a stylized rhythmic music that commonly accompanies rapping, a rhythmic and rhyming speech that is chanted.[2] It developed as part of hip hop culture, a subculture defined by four key stylistic elements: MCing/rapping, DJing/scratching, break dancing, and graffiti writing.[6][7][8] Other elements include sampling (or synthesis), and beatboxing.

Good citizens defines hip hop like this:
A bunch of bums whining people, dressing like zombies, talking like dogs, consuming all kind of drugs, drinking like there's no tomorrow, listening to an annoying noise that sounds like two skeletons dancing on a metal plate, making "graffiti" in good people's walls without permission and always waiting for "the first of the month" when the paycheck comes in. And even so, they call it "culture".