I'll pee on Rihanna, see man I do what I wanna

from Eminem – Medicine Ball Lyrics on Rap Genius

Meaning

Em collaborated with Rihanna on his next album, Recovery, and scored a massive hit on the song, titled “Love the Way You Lie”

He’s also making a pun of the words “see man”, and making it sound like “semen”.
Despite Eminem’s Rihanna diss, he is still able to do what he wants to, collaborating with her later on (although he didn’t know this at the time he proved his point)

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