What is mega slang?

Excuse me, could you please explain what exactly is meant by the term 'mega slang'? I'm curious to know if it's a specific type of language or slang that's popular in a certain community or subculture. Is it related to a particular region, era, or perhaps even a specific hobby or interest? I'm intrigued and would appreciate it if you could provide some context and examples to help me better understand this term.