The only thing they really worry about is me and the pen

from Childish Gambino – Pound Cake (Sway In The Morning Freestyle) Lyrics on Rap Genius

Meaning

Bino' Got Em' Shook!

Rappers better watch out when he’s penning a verse because he’s just that good.

However it’s a pretty safe bet that Donald is also good with the pen in reference to his career as a writer/actor before he ever started dropping verses, for example 30 Rock alongside Tina Fey.

“When I wrote for 30 rock, I was under 25.”

There’s a wordplay here on pen, as in writing instrument, and penitentiary, as in, people are concerned about whether Bino is gangsta enough, i.e. to have done jail time.

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