Spanish for 'key chain' or 'key holder.' Means shot caller in prison or jail. The Llavero has the keys to the yard.
Ex. 1

"Koko decided one day to lock up. He was a Llavero, he ran the yard...When you lock up, they want you to give 'em something. They don't care what it is. Something no one else knows. He decided to give up all the fieros, the weapons on the yard. He left all the Southerners empty handed."

Stories Written by a Current Prisoner, "California Prison Flipped the Script," March 7, 2020

Ex. 2

Chino: Hey homey! I just touch downed at the compound! I need to get at the Llavero and show him my paperwork!

Gato (points): He's that dude: Comadreja.

Comadreja chows down on a drumstick and lets out a loud belch.

Chino: The fat dude with titties? What kind of program are you guys running?

Gato: Hey bro: You don't like it, go ring the bell in the program office!

Chino: No muthafucka! You and that fat fuck can go ring that fuckin' bell! I'm the Llavero from here on out! Get down and give me 1,300 burpees!
by ZXY&ABC July 21, 2020
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