Anybody know what this hand sign means? Why do so many people do it?

the T shape means "thizz" which is a drug that consists of ecstasy (MDMA), speed, cocaine, meth, LSD, heroin, and other drugs. its a party drug that is usually taken at a rave (dance club) mac dre came up with the "T" and all it is for is to look cool. the "C" could be a gang thing or it could be refering to a type of thizz. if you have ever heard the song thizzle dance, this is what its talking about. you may have also heard terms like "thizz face", or "smackin"