Ain't gettin' paper, nigga here's a loan
My shit long, need a hair salon
Get it cut, shut the fuck up

from J. Cole – Niggaz Know Lyrics on Rap Genius

Meaning

Getting paper = getting paid.

Short on cash homie? No worries! J. Cole has enough to go around. In fact, his stash has grown so out of control, he needs a hair salon to keep it in check.

(The hair salon here would basically be all the people borrowing from him. He keeps his money pile at a satisfactory height by giving away whenever he can.)

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