She’s on my dick cause I spit better than you
This line indicates that there is a good chance he is comparing this girl to hip-hop, as spitting is another word for rapping. So in other words this girl will always flock to the best spitter, who right now is Eminem.
But it also fits as a regular line, as spitting is also slang for ejaculation; i.e. Em can steal her from you because he’s better at sex.
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