I know I'm quick to get outta line like I have to pee

from Hopsin – Hop Madness Lyrics on Rap Genius

Meaning

Referring to the fact that the music video is set in an amusement park, because you get out of line for a ride (his dick) if you have to pee. Also, he has a lot of dick riders if there are that many people in line to ride his dick.

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