What does duffy mean in slang English?

"Duffy" in slang English doesn't have a widely recognized, single, consistent meaning. It's possible you're thinking of a specific regional slang or a word used within a particular group.

Here are some possibilities, depending on context:

* "Duffy" as a nickname: It might be a shortened version of a name like "Duffy" or "Dufford."

* "Duffy" meaning drunk or intoxicated: This is a less common usage and might be specific to certain regions.

* "Duffy" as a slang term for something useless or worthless: This meaning is also not very common and could be a regionalism.

To help me understand what you mean, could you please provide more context?

* Where did you hear the word "duffy" used?

* What was the situation?

* What was the speaker trying to convey?

With more information, I might be able to help you figure out the intended meaning of "duffy."