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