Nudiustertian

Nudiustertian (pronounced noo-dee-uhs-tur-shuhn or nyoo-dee-uhs-tur-shuhn)

Of or relating to the day before yesterday (obsolete).

1647: From the Latin nudius tertius, formed from the phrase nunc dies tertius est, (literally “today is the is the third day”).  It was coined by the author Nathaniel Ward (1578–1652) and used in his book The Simple Cobler of Aggawam in America (1647).  Nudiustertian is an adjective and no other forms seem to have evolved although the noun nudiusterianist would presumably be a slang term for one who "lives in the past" and the noun nudiusterianism would be the movement which advocates that lifestyle choice.  

Words long and short

Depending on the extent of one’s pedantry, English contains probably between a quarter and three-quarters of a million words but only a few thousand could be said to be in common use.  English speakers have been so fickle that whether a word survives, even if only as a rare and obscure thing, or become obsolete, seems random.  Constructions can of course be specific to a time, place or personality and words like Lohanic (something of or pertaining to Lindsay Lohan), Lohanistic & Lohanesque (something in the style of Lindsay Lohan) or Lohannery (a behavior ascribed to or associated with Lindsay Lohan) may end up stranded in their era whereas Orwellian (pertaining to the ideas discussed in certain novels by George Orwell (1903-1950)) will probably endure because the concepts involved transcend the people or events associated with their coining. 

Puritan lawyer and clergyman Nathaniel Ward (1578–1652), author, inter alia, of the first (1641) constitution in North America, coined nudiustertian and it quickly went extinct, despite being a handy five syllable substitute for the phrase “the day before yesterday” which demanded an extra syllabic brace.  He also invented the evidently self-referential nugiperous (given to inventing useless things (from the Latin nugae (nonsense or foolish)) which suffered the same fate.  Yet penultimate (from the Latin paenultimus, the construct being paene (almost) + ultimus (last)) survived and flourished despite needing an additional syllable compare with the punchy “second last”.  Even the once more popular “last but one” was more economical, as was the more modern creation “next to last” but penultimate kept its niche.  People must like the way or rolls of the tongue.

Penultimate must then have occupied a linguistic sweet-spot because antepenultimate (last but two), preantepenultimate (last but three) and propreantepenultimate (last but four) are essentially unknown.  Also long extinct are hesternal (from the Latin hesternus (of or pertaining to yesterday)), hodiernal (from the Latin hodiernus (today, present), ereyesterday (from the Old English ere (before) + yesterday) and overmorrow (from the Middle English overmorwe, from Old English ofermorgen (on the day after tomorrow)).