Nabsack
A tiny beaver that lives on your hip is called a nab. The bag it lives in is called the nabsack. It's so smelly, it could make a dog cry.
'I just got a new nab. It's the third one this week. My nabsack is getting crowded.'
'Your nabsack is so bad, I think it's been eating my lunch.'
'I tried to pick up my nab, but my x-ray said it was busy pooping.'