Natto Stink Nose

Okay, so maybe you've read one of my old posts entitled Old Man Stink Breath. Natto Stink Nose is in the same league as that. I'm not sure exactly where it comes from, but your nose will just smell rank! Maybe it's because of all the decomposing boogers and rank snot in there. Does anybody know the exact cause? If you do, please let me know. (That goes for old man stink breath as well.) It's sooo much easier not having to think about which orifice it's safe to breathe from and in which direction you are breathing.