Tell a bitch that she better bring a friend
And if she want an autograph she better bring a pen

from Mac Miller – Donald Trump Lyrics on Rap Genius

Meaning

Before K.I.D.S., Mac would most likely gladly deal with one girl and bring a sharpie to sign peoples shit.
Now he’s at the height where he requires a minimum of 2 girls and he leaves it to his fans to bring the pen for signings.
Mac, remember the only reason why you’re popular is because of your devoted fan base.

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