I think you may be referring to Filler by Minor Threat. Of course, he is actually saying it’s in your head so I may be wrong.
MINOR THREAT LYRICS
“Filler”
What happened to you?
You’re not the same
There’s something in your head
Made a violent change
It’s in your head
It’s in your head
It’s in your head
Filler
You call it religion
You’re full of shit
Filler
Was she really worth it?
She cost you your life
You’ll never leave her side
She’s gonna be your wife
It’s in your head
It’s in your head
It’s in your head
Filler
You call it romance
You’re full of shit
Filler
Your brain is clay
What’s going on?
You picked up a bible
And now you’re gone
It’s in your head
It’s in your head
It’s in your head
Filler
You call it religion
You’re full of shit
Filler
You never knew
You never will
Filler
You’re another sheep
Looking for a shepherd
Filler
What is going on?
Filler
Filler, filler
Filler in your head
