Snakes do not urinate; they excrete a soft feces that contains uric acid and all digestive products. These products of the kidneys and the digestive tract combine and then exit the snake's body via the cloaca.
The cloaca is a single opening on the snake's belly that also acts as an opening to the reproductive tract as well as the digestive and urinary tracts. Fish, insects and birds have similar digestive tracts, excreting one semisolid waste rather than a liquid and a solid waste as is the case with mammals. A snake also lacks a developed bladder for uric acid storage and stores the acid in its ureters, the tubes that transport uric acid from the kidneys to the cloaca, until the snake is ready to excrete waste.