I think the issue is the "us" is not a suffix, but rather
Posted on: August 29, 2019 at 09:46:41 CT
MizzouAstro
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a part of the body of the word. Thus you don't change the body of the word, but rather add a plural suffix to it.
So it could potentially be Doofusi, but that is silly and my middle school Latin class level knowledge leads me to lean toward Doofuses.