A Savai is a person who is part of the popular group in your school, handsome but dumb. He tends to joke around too much and loves being annoying with his friend group. He still has his charms though, he tends to be really cute.
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).