Do you have piss shivers?

[SethOmega]

"The simplest explanation, though, is that the rapid release of warm fluid lowers the body's overall temperature leaving it to react the same way you would in a cold breeze."
http://www.cracked.com/article_15953_sle...ained.html

again, I've never had it before, so

Actually, urine is only warm because your of your body's internal temperature. When urine leaves your body, your body temperature does not change.