What's the Korean word for "pee shivers"?

ANSWER: 진저리

In an article, HERE, which NBC News jokingly refers to as "yellow journalism,"  the phrase "pee shivers" is described as follows:

When grown men and little boys urinate, occasionally our entire body is abruptly racked with a mysterious, internal blast of cold that makes us visibly shudder from the shoulders down. It typically occurs near the end of the task, lasting roughly one frigid second.

The phrase 진저리 나다 can be used to refer not only to the uncontrollable shivers boys and men sometimes get after urinating but also to the shivers people sometimes get when they are afraid.

By the way, what are 1800 Korean expressions every Korean fifth grader should know?

Click on THIS LINK and find out. Do not be afraid. It is just a link to a new and interesting Korean children's book entitled "초등 국어 표현력 사전," which I will creatively translate as "Dictionary of Expressions Every Korean Elementary School Student Should Know." The linked page shows you an extensive free preview of the 392-page book.