What does juana mean in spanish?

"Juana" is a Spanish feminine given name, the equivalent of the English name "Joan" or "Jane".

It's important to note that "juana" is not a slang term for marijuana. That's a misconception that stems from the fact that marijuana is sometimes referred to as "weed" in English, and "weed" in Spanish is "hierba". The word "hierba" can be used to refer to marijuana, but it's not the only word for it, and "juana" is not a synonym.