A recepticle for urine attached via a catheter, as worn by old people and Craig David

When you eat dirt for the first time and leave your family to build a shack in the woods

Urinary bladder. In anatomy, the piss bag is a hollow, muscular, and distensible organ that sits on the pelvic floor in mammals.

Someone who amounts to nothing more than an object that could be used for urination. Usually someone that has no real friends but still seems to follow a group of people around, even though they are unwanted there.

The large mound of bulging fat just above the clit directly below the navel on a woman. Looks just like another fold of fat located near the vagina.

Some notables with a large "piss bag" would be Rosane Bar and Star Jones

Another term for an asshole

Or a woman who is interested in meaningless sex