"Hallucination" makes it sound like ChatGPT drank some of the punch without realizing it was laced with LSD. "Bullshit" sounds more like what comes out of an overconfident ass who should or could know better with some better education.
(Issue is, now some are convinced that people in general would do the same and just blurt out the feedforward output of their "internal neural network", as opposed to having built knowledge in a loop of critical evaluation.)
And why would that be? "Hallucination" means "erratic wandering", implying one is lost - similarly to "delirium" (maetaphor using the plough) and "error". Part of the idea is that of "instead of witnessing the correct, reporting the false" - a very ancient, traditional idea, and akin to the concept of "intelligence" (intus-legere).
"Confabulation" means locutor and interlocutor are talking, exchanging narrations.
but I am not sure - provisionally - that it can be a good idea to relate strictly human neurology to ANNs, if based on phenomena as opposed to structural issues. You do not have that problem when staying with natural language.