This abnormally long word is not found in the dictionary.
It means that you do not know what to say about the previous comment, or you may have not been paying attention but you are willing to give an answer to a question.
It is mainly a filler. A simple statement of not knowing, but makes you sound smart.
Nina- "Hahaha. That is hilarioius! Isn't it Joe."
(At this time Bob and Nina laugh, then leave the room to find a dictionary so that they will understand there highly intellectual friend.)