Like the title says, I want to know what obscure unknown words you love and their definitions.
For me it's definitely phantasmagoric which means a rapid series of events like occur in a dream, but I often find myself using as if it meant fantastic just because it sounds better.
Mine would have to be PHENALALINE - I think its spelt like that.
That is a chemical compound found in chewing gum that can have a laxative effect if taken in excession...I like using it because no-one else knows what it is.