In a manner relating to or characteristic of excrement; in a waste-like or disgusting way.
Adverbial form of excrementitious, using the -ly suffix to convert the adjective into an adverb describing how something is done or appears.
Imagine describing someone's behavior as 'excrementitiously annoying'—it's such a fancy, old-fashioned way to call something gross that it became almost comical, which is why you rarely hear it used today.
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