You didn’t even know you wanted this, but here it is anyway. The song is called It’s My Belly Button and it is just as absurd as it sounds.
It’s by Rhett & Link, who, best we can tell are some sort of comic duo. Practitioners of the absurd. And so forth.
The premise here is basically, hey, there’s a hole in my stomach. What the hell is this? Oh, it’s a belly button. Let’s sing a song!