What does "Muggles" mean?

Definition: No, this is not referring to the non-magical boring normal people in the Harry Potter universe. In fact, the term ‘muggle’ was coined as slang for a joint or marijuana cigarette by American jazz artists in the 1920s and 30s.

Example usage for Muggles

"Dude, if we just use the word muggles, we can totally talk about weed and shit and people are just gonna think we're Harry Potter geeks."