* A local or niche reference: It could be a slang term, a specific product or service, or an event in a particular community that I don't have information about.
* A misspelling or variation of something else: Maybe you meant "Funky Monkey" and the "21" is a mistake.
* A fictional concept: It could be a name from a book, game, or other creative work that I haven't encountered.
Could you provide more context? For example:
* Where did you hear this term?
* What was the context surrounding it?
* What kind of information are you looking for?
With more information, I might be able to help you figure out what "Funky Monkey 21" refers to.