Were are able to smell it for a slight second sometimes
"I wondering how does anyone know whether the are suffering from bad breath or bo?"
we from reactions mostly
bad breath = you can it on the face of the person your are talking too they try to look away
bo = even when u dont talk people sniff when your around
i suffer from both lol :3
"I even read on this forum of ppl saying they believe their smell is coming from their anus."
You get a weird feeling down there, unless you've had it u wont know what it feels like, and also you smell Fecal odor that can also show that it might be coming from down there