Catheter Bag

a bag used to hold piss/urine, which is connected to the vangine/penis part where the wee comes out. Can be disposable or not, and is often used in hospitals.

"Hey can i get a catheter bag in here?" "oi cassie get in here!!!!"

or

"hey did u see cassies face the other day?" "yeh it looked kinda like a catheter bag...ewww"