Though Travi$ Scott recites this hook, it’s likely that Pusha wrote it. Under this assumption:
Pusha sells his crack to his devoted fiends.
The fiends might be called a “flocka” (flock) in a religious sense, given that Pusha proclaimed himself the “new god”, even controlling the elements. Or it could just be a comment on their crack dependence, since sheep depend on their shepherd for protection from wolves and such.

And, of course, Jesus is known as a sheperd. Peep John 10:1-21
14 I am the good shepherd, and know my sheep, and am known of mine.
15 As the Father knoweth me, even so know I the Father: and I lay down my life for the sheep.
The line also sounds like he’s saying “Servants in my flocka” which would imply that his crew’s got his back no matter what