While I'm masterfully constructing this master piece (Yeah)
Eminem is the master at what he does, so he says that he is bad news for those who spit whack rhymes. Never mess with a god.
According to Wikipedia, a masterpiece is a work that is considered the greatest of a person’s career due to outstanding creativity, skill, or workmanship. Eminem’s Rap God will be considered his masterpiece, like the Mona Lisa is to da Vinci.
Note that Em pronounces “piece” from masterpiece the French way, with two syllables, i.e. ‘piece de resistance’, manipulating the word to fit the rhyme scheme, hence showcasing how masterful he is.
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