These mothafuckas are thinking I'm playing
Thinking I'm saying the shit cause I'm thinking it just to be saying it

from Eminem – Kill You Lyrics on Rap Genius

Meaning

People think he’s not the psycho he claims to be

Of course, Eminem is ‘not’ the psycho he claims to be — Slim Shady is a character — but he does like messing with his haters' heads

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