SCAG Meaning of SCAG in English I. scag /skæɡ/ BrE AmE noun [uncountable] informal another spelling of ↑ skag II. skag BrE AmE , scag /skæɡ/ noun [uncountable] informal ↑ heroin Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012