Isn’t it a bit too much?
There’s something sticking out of you while you’re in private. It’s poop! You can’t just poop in public, that’s illegal and gross in this day and age. So the next time something starts to come out of you when you’re in private, think, “Ah yes, it’s poop.”
There is something small in some poop. You lean in, carefully pull it out, and realize it’s a thread. Why is there some thread in this small poop? Because it’s cat poop. And cats love to eat thread when you aren’t looking. And floss and hoodie strings and mouse tails. But this poop just has thread in it.
You have some thread… what’s the first thing you do with it? You take it and put it in your mouth, and start sucking it down like spaghetti. You have decided to eat (いと) the thread.