Funk is musk that's over 4 hours old.
Musk is like a man sweating after a rigorous workout with their muscles all swole... It's hot but please go shower mkay thanks πΏππ§Ό
It's just naturally such a dirty place too. Blood, urine, feces, germs. I think it's the feeling of being dirty, but you're also basically walking swiftly for 8-12 hours straight. Doesn't help.