They know I put it down, now they wanna say wassup
When you see me in your town, say wassup
Roll around, say wassup

from Jay Rock (Ft. Ab-Soul, Kendrick Lamar & ScHoolboy Q) – Say Wassup Lyrics on Rap Genius

Meaning

They= Family, friends, haters, women, children, brother sisters, fans.
Know that they be snapping off at they shows, dropping dope ass verses. Now that they he is gaining popularity wanna acknowledge his presence. Just say to him in your city and when he rolls through the hood.

“Wassup?!?!?!”

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