The speaker claims an identity built from things that are slightly broken, unfinished, or overlooked. Loose threads, glitches, weak spots in a fence, and pizza without cheese all pile up as a kind of family tree. Instead of treating these imperfections as embarrassing, the speaker says plainly, "I come from" them, and means it as a point of pride.
The second half makes the idea more personal. Most people dislike the corners where walls don't quite meet, but the speaker calls that "home" and says it's where they hang out. Those narrow spaces, like cracks in stone or the gap under a door, become places of belonging. The tone is playful, with details like mystery-flavored dumdums and ripped jeans, yet it carries quiet defiance. The mood is relaxed and confident, a shrug at anyone who expects polish. By repeating the opening line at the end, the speaker closes the loop: being unpolished isn't a problem to fix, it's where they belong.