This is a funny joke.
The person running the game plays as the GM (Gamemaster), and everyone else is an MC.
When you rep the four pillars, roll +legit. On a 10+, cipher 2. On a 7-9, cipher 1 and beef 1. Throughout the scene, you may spend cipher to: add +1 to a hot roll, give everyone in the cipher +1Hx with one another, give someone +1forward. If someone got beef, they can spend it throughout the scene to: add +1 to a hard roll, give someone -1 forward, start a Front* (*as is "to front 'gainst someone").
Now, some moves that various playbooks can buy:
Hustle (for the Smooth Cat playbook)
Add this to the list of options for when you spend cipher: gain +1barter.
Too Legit To Quit (for the Survivor playbook)
You have Armour equal to your Legit.
Limelight (for the Producer playbook)
When you produce for someone, roll +cool. You get the effects of repping the four pillars without actually doing it. The cipher and beef can be spent to introduce effects not contained within this scene, montage style.