Proper. What you say Hammer? Proper
Rap is not pop, if you call it that then stop

from A Tribe Called Quest – Check The Rhime Lyrics on Rap Genius

Meaning

http://www.youtube.com/watch?v=MrsCIK9s2wI Some people think that hip-hop is just a sub-genre of pop. This makes Q-Tip mad. References a MC Hammer ad for Pepsi. When Hammer gets a pepsi at the end of the commercial he says “proper”. People in the rap community were upset at him and said that he had sold out. Notice the double meaning when Tip says “pop”.

source: gc28 via hip-hop-has-no-color

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