Farnuculent does exist as a real word, however, it is defined as a
fabricated word.
I didn't
understand the drunk man at the bar slurring his speech and mumbling farnuculent phrases. I think he was inventing insults and uttering them under his alcoholic breath.
Stubbing one's toe
in the middle of the night on the way to the bathroom might induce a phrase of phonetic peculiarity such as, "eeyaag!" This word, if used, would be farnuculent.