Floccinaucinihilipilification. “The act or habit of estimating something as useless.” It’s not as long as that lung disease, but I for one use this word in conversation all the time. Everyone else, on the other hand, thinks it’s useless.
I would venture to guess that FireUnderpantsBoobs would disagree with that! 
penetralia – the innermost secret parts. Really a damn fine word, but difficult to use with any amount of class.
Hey Andy!(longtimenosee)
This is true: I was gonna look for an appropriate useless word in the dictionary; opened it up, & my eyes fell first upon this entry:
** willie-waught**: n[by incorrect division fr.Sc guidwillie waught cheering drink]:a deep draft (as of ale)
What lovely serendipity! That word appears right at the time I’ll probably ever use it to say I’d like to have a willie-waught with ya, Ange. (Southern thang fer Andy)
There ya go…
It seems that advances in the field of medical terminology now give as the longest factitious word in the OED:
pneumonoultramicroscopicsilicovolcanoconiosis (45 letters)
In many countries, agglutinative words are limited only by the imagination and are not found in standard dictionaries, hence the Swedish word:
nordostersjokustartilleriflygspaningssimulatoranlaggningsmaterielunderhallsuppfoljningssystemdiskussionsinlaggsforberedelsearbeten (130 letters)
which means ‘preparatory work on the contribution to the discussion on the maintaining system of support of the material of the aviation survey simulator device within the north-east part of the coast artillery of the Baltic’.
This is not to say these words are useless, rather that one should employ a typist of no mean profiency before using them.
Not Catholic, are ya?
Hey, as long as we’re throwing in really long useless words, why not the peak of periphrasis from one W. Shakespeare of Avon: HONORIFICABILITUDINITATIBUS.
A so-called “pedantic nonsense word” which is essentially HONORABLENESS on steroids, it can also be rearranged to spell “Hi ludi F. Baconis nati tuiti orbi.” Translated, “These plays, F. Bacon’s offspring, are preserved for the world.” For all you conspiracy fans 
- Dave
numismatist - coin collector
callipygous - having shapely buttocks
smegma - a type of cheese
Good word-- is the other word you’re looking for siderosilicosis, by any chance? That used to be called “black-lung disease.”
all i can say is, EEEEEEEYUCK!!!
Finally, a thread that I can get some help out of. there was a word I found in a dictionary, near the back. I mean WAY enar the back. It was a Z word, and it meant "A small gun (or canon) taht is usually mounted on the back of a camel. I think the word was something like Zymbol or something like that… anyone know what I am talking about???
::GAG:: That’s awful…
{Setting: dinner, typical suburban family}
little girl: Daddy, would you please pass the smegma??
daddy: of course, hunny. ::Ziiiiip::…here you go, is this enough???
[sub]oh my gosh, I took bad, and made it worse, I am SO sorry[/sub]
Then, of course, there’s “williwaw”: a cold draft (as of air).
“Paneity” is of use when discussing transubstantiation or, one supposes, inept sandwich-making.
My brother-in-law, who’s chapter clerk of a cathedral, sometimes has to porrect things (offer them horizontally forwards). Chalices, I think.
I defy anyone to come up with porn links for that one.
My new favorite word!
My previous favorite word was fimicolous – adjective describing an organism that lives in and eats feces. (It makes a great insult… “you fimicolous bastard!”)
For more words like callipygous, one of the entries contained therein, try Mrs. Byrne’s Dictionary of Unusual, Obscure, and Preposterous Words.
Ummm…I’ll stick with the “jury of my peers” thing, thanks…
Grauple- snow that isn’t really in flake form, and isn’t really sleet either, but kind of in between. It reminds me of styrofoam beads.
Lets see here…Battology is useful. It’s a noun for the superfluous reusal of a single word or phrase periodically throughout writing or conversation. This could probably describe me sometimes; after seeing the Big Lebowski I used the phrase “out of your element” for a good solid…actually i still use it. Whatever.
Butyraceous: Butter like in consistency or quality.
Why? WHY DOES THIS WORD EXIST?