So I will not stutter when I'm shoutin' fuck you, son

from Earl Sweatshirt (Ft. BrandenBeatBoy) – Stapleton Lyrics on Rap Genius

Meaning

Since Earl stowed away his heart, he doesn’t give a fuck, and will say “fuck you” to whoever is listening (he is addressing the listener directly).

It is a play on words because “fuck you, son” is what Earl thinks his father is thinking leaving him as a bastard child.

“Son” is also a homophone of “sun”, relating to “moon” in the next line.

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