Superlative expressing that something is alot better thansomething else.
Somtimes used in order with much more better, more better, and better for degrees of relation.
A word used when the actual name of the object in question will not come to mind. Very versatile but often very vague. It is derived from the phrase "what-you-may-call-it" which can be found in T. H. White's The Once and Future King. Translated by a German who misunderstood.