And all my niggas in the pen

from The Notorious B.I.G. (Ft. 2Pac, Big Daddy Kane, Scoob & Shyheim) – Hot 95 Freestyle Lyrics on Rap Genius

Meaning

Pen is short for penitentiary a.k.a. prison

This is a double-entendre too. He writes his raps with a pen, so he’s basically saying his homies are with him every bar he writes

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