Submitted by twovests in television
Mr. Milchick is very well spoken and specific in his language. Everything he says reads as something natural, and not forced.
He doesn't use big words to use big words, it's just how he speaks. He's not trying hard.
"Devour feculence", however, was an uncharacteristically tortured phrase. That was a bit of characterization-- we were seeing the one time in the show he intentionally takes a simple phrase ("eat shit") and finds big words for it.
It works because the words are... Wrong.
It's very clever writing, too. You never heard the word "feculence" before, but you've heard the suffix "ence". "Feculence" is not "feces", it's the quality or condition something can have. "The feculent state of the washroom was indefensible".
And "Devour" was, likewise, wrong. "Eat shit" is an imperative-- that is, a command. Although not one issued literally, it's a demand to "Put poop in your mouth and swallow it."
But "devour"? Devour implies a fervor. It implies a hunger, a greed, a desire to consume. It implies a destructive speed. It is a form of consuming that is almost conquest.
You can tell someone to eat shit, but you can't make them devour it. Devouring is something that comes from within.
If the writers wanted, Milchick could have said "Consume excrement", maintaining the same literal meaning of "eat shit" (with the residual meaning of the phrase being delivered later.)
TLDR: When Milchick said "Devour feculence", you can tell it was a tortured phrase. This was the one time he used big words for the sake of using big words.