Someone who has a weak bladder (ie, has to pee more than is normal) is said to have a Woolworths bladder.
It refers to the fact that object bought from Woolworths are often cheap and shoddy.
Kid: "Glenmore Park Woolworths sucks"
Mother: " I know son we will leave here in a minute if they open up a register instead of pretending to whipe down bench tops"