1. SD is a Chicago based rapper currently signed to Glory Boyz Entertainment (label under Interscope), with fellow label mates Chief Keef, Lil Reese, and Fredo Santana to name a few. 2. SD (formerly known as Ski Demon) is a British UK drill rapper and a member of Harlem Spartans, a gang from Kennington, South London. Read more on Last.fm