I think "Piss Shiver" is much easier to say and understand though.

According to an online internet poll (the most scientific of research methods), 83% of males and 58% of females have felt a piss shiver in the past year. No word on whether females get to experience "multiple piss shivers".

Shivering occurs because of heat loss from the body parts usually covered by clothing. If this theory is correct, the feeling should be more common in cold climates. This is unknown.

Just like there's no explanation for why Heidi and Spencer are famous in any sense - normally no-talent assholes tend to not be famous!

Shivering occurs because of activation of the parasympathetic nervous system (PNS) by sympathetic nervous system (SNS) activity involved with urination. It is the SNS which acts to control bladder function; it makes sure that the bladder is relaxed and that the urethral sphincter is contracted. Part of the SNS response causes the brain to produce a number of chemicals, including the catecholamines epinephrine, norepinephrine, and dopamine. These chemicals act on the PNS which normally controls shivering. If this theory is correct, the feeling should be as common in females as in males, but it is far more common in males.

Shivering occurs via passage of spermatozoa into the urinary canal. So, basically, if this is true and you're a woman, you have bigger problems than the piss shivers.