Aye perhaps in this case tsuwm, but did not Lewis Carroll make up a slew of words in Alice in Wonderland that are now part of our everyday vocabulary and translatable.

Figures I can't think of an example right now but I'm sure those with better "spur of the moment" memories will know the words I speak of.

Speaking of which...I know there is long-term memory and short-term memory but is there a term for that type of memory retrieval?