Posted in Business & Finance, Internet Slang, Schools & Education YSS stands for Youth Support Services (various locations) YSS stands for Youth Services Section (New York Police Department; New York, NY) YSS stands for You Suck Severely YSS stands for Youth and Shelter Services, Inc (Ames, IA) YSS stands for You’re So Slow YSS stands for Yanic Simard Selected (Toronto Interior Design Group; Toronto, Canada) YSS stands for You’re So Sweet YSS stands for You’re So Smart