Sudden Ice Shift Syndrome. An event that sometimes occurs when a person is drinking a beverage containing ice. As a container is tipped up to pour the liquid into the mouth, a mass of ice, formerly lodged near the bottom of the container, shifts under the force of gravity, causing the beverage to spill down the chin of the drinker. This phenominon is not observed when drinking through a straw.
As he mopped the stain on the front of his shirt, the young man who had just tried to pour the last of his long island iced tea into his mouth exclaimed "SISS!" (pronouncing the acronym S.I.S.S.)
by Dale Seng November 23, 2006
Get the S.I.S.S.mug. by JAE26 March 28, 2007
Get the S.I.S.S.mug. SIS is a school in summerside P.E.I where kids like to wipe shit all over the mirror in the guys bathroom for fun and where kids like to vape in the school bathroom what a lovely school
guy one "did you hear about S.I.S"
guy two "ya isn't that , school that likes to wipe shit on mirrors and vape in the bathrooms?"
guy one"ya exactly"
guy two "ya isn't that , school that likes to wipe shit on mirrors and vape in the bathrooms?"
guy one"ya exactly"
by shit picker November 29, 2019
Get the S.I.Smug.