东北第四省

Meaning

Derived from "If the bookstore doesn't have your book, I'll burn the bookstore" and "Boruto is non-flammable". Someone thought a comment was so good that they'd burn the bookstore for not having that commenter's book. So the bookstore owner decided to replace everything with Boruto. Usage: "I burned the bookstore, was I right?" → "I'm that owner, luckily my store only sells Boruto"; Great comment → "Don't come burn my store, it's all Boruto"