Drop the World Rebirth Eminem

I know what they don't wanna tell you

Wayne knows that the world is coming to an end. Thus he has a "spaceship" to take off and leave earth.
Stu618
Lil Wayne is saying that he is aware of the subliminal [secret/backwards] messages behind songs by other music artists these days & that the public however, are not aware.
TruthBehindItAll