Nabsack
A tiny beaver that lives on your hip and smells like old gym socks is called a nab. The smelly bag it lives in is the nabsack. You can only see it with a special x-ray that your grandma uses to find her missing socks.
'I saw a nab on your hip, but it ran away when I told it I was going to throw it in the toilet.'
'My x-ray said there were three nabs in my nabsack. I now have three stinky bags on my hips.'
'Your nabsack is leaking. I can smell it from here.'