To my niggas in the penitentiary
Loc up like a motherfucka when they mention me

from 2Pac – Str8 Ballin' Lyrics on Rap Genius

Meaning

Pac had a lot of his closest friends locked up in jail, but whenever they heard about how well Pac was doing for himself they started to get rowdy while they were reppin' him and his music to all the other inmates.

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