Hang the rat

That stumbling down the street while wrecked term when you've got to pee and no bathrooms in sight.

To defecate.

to show your flaccid dick.

also known as 'showing a rat', 'dangling a rat'.

Another slang term for peeing.

To urinate. Usually after drinking large amounts of coffee or beer.

hanging a rat refers to the slow, methodical art of defecation and was a term first used in mid-16th Century Scotland by nobles and feudal lords.