Dave Grohl wrote the song about Veruca Salt frontwoman Louise Post, whom he was dating after separating from his first wife, Jennifer Youngblood. He said..
"Everlong" is about "being connected to someone so much that not only do you love them physically and spiritually, but when you sing along with them you harmonize perfectly"
Foo Fighters - Everlong (2017) ▶️
If you believe anything this fucking pathological liar tells you, you’ve willingly abandoned reality. In other words, you’re a fucking moron and there’s no hope for you.