drinking your own urine while on ecstasy, meth,ketamine,mushrooms,acid to prolong the experience. drinking another person's urine scores you +10 crackhead points.
Ecstasy is rapidly broken down by the liver but about 60% enters the urine unchanged. The urine could be drunk to recycle it, in the same way that Siberian tribesmen drink each other's urine after eating magic mushrooms. This is known in most circles as 'desperate'