Is “duh” a common exclamation?
"Duh" was more common in the early 2000s, but now is only used sarcastically because it is considered somewhat rude to say. Right now, young people (mostly teenagers) only use "duh" when the person they are speaking to clearly knows they are joking. "Duh" should not be used in formal situations. Ex: Of course I am the coolest person ever. Duh! Ex: Duh my favorite color is black! Can't you see that everything I own is black?