Urban dictionary:
duffus
Name for the worst people in existence, also name for vagina or something that’s broken.
He was really living up to or down to his name...
Hmmm. Never heard “duffus” before. “Doofus” was a New York City expression, probably from the Yiddish, meaning backside. Such as, “he was sitting on his doofus all day while I did all the work...”
I don’t care what an urban dictionary says.
Duffus (doofus) means “fool” ... “don’t be a duffus” = “don’t be a fool”
Similarly, “teabag” means something I put in a cup of hot water to brew tea, no matter what some fools may think it portends.