Everybody knows I'm a motherfucking monster

from Kanye West (Ft. Bon Iver, Jay Z, Nicki Minaj & Rick Ross) – Monster Lyrics on Rap Genius

Meaning

You can love him or hate him, but either way you gotta recognize Jay-Z as a lyrical beast; a monster in hip hop.

This may also be an answer to the above question. Everybody may refer to the Sasquatch, Godzilla, King Kong, etc. They, while monsters in their own right, recognize Jay-Z to be a real monster.

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