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My first offering is the word "Pish"
It is a word of numerous meanings, the most common of which are "an expression of disdain" and "a variant of piss."
Great word.
What have you got?
Nefarious and cogniscent are favourites of mine. And ne'er-do-well.
Giddy kipper
Assbandit
Twunt
Juxtaposition
Cromulent
Spaff
Poppycock
Lubricious.
Moribund
Corpulent
Crepuscular
Fluctuant
etc.
The medics know how to describe stuff
How about a good old mucopurulent?
Lubricious.
Pinteresque.
Adoxography
Somnambulant
Clunge
Cretard
Jerkin
Crepuscular
Love that word!
Pulchritudinous.
Posh is brilliant! Also one of Glasgow's gifts to the english language: bawbag
As in: he's a wee....
Oh... And 'tabard'
spifflicate
Maggot!
😆
Truculent
Rascal
Gland
defenestrate
To throw out of a window; I suggest it daily!
[i]defenestrate yourself as the amount of f'ks I give is slightly below 1![/i]
Gusset
Spigot
Fawcett
Plop.
Mothership.
Trebeculated
Nonchalant
Verbalize. Unnecessary Americanised jargon, taking the verb to talk and making a longer alternative for ( as far as I can see), no real purpose.
Love to throw that into a conversation with a straight face.
Mingin
Ginormous
Blumpkin
Cretin IMO is vastly underused.
Oui.
Oui, oui, oui, oui !
Fug
Not going to win any phonaesthetics awards, but I really like it when someone exclaims "capital!" instead of excellent. You need to be really posh to pull it off though!
drip, doughnut, pain, girl.
flange
Mellifluous is a personal favourite of mine.
quim
Knob Jockey
Patrick Smiddies(diddies-to describe women's breasts)
Nice one Binners, "flanges" goes well with "spigot". We could add Swage.
Bupkiss
Spooge
Assuage
Serendipidy
Pyrometallurgy
Troth
Manumission
Tony Danza
As I have teenage kids;
Please
Thank you
Vibraphone.
Winkle.
Ample.
Replete.
Corruscate.
Mountebank.
Discombobulate
succubus
rambunctious is a personal favourite
Oui, oui,
sounds like you're talking pish
sorry igmc
Oxter
Fettle
Fangle
Both totally bike-related 🙂
Minge
Stracciatella
Current fave in our house is;
'Cockwomble' e.g "You absolute cockwomble" or "what a bunch of cockwombles"
+1 flange
Land pirates
Nothing either diffuses an argument or gets you punched in the face faster than calling someone a Nincompoop
Poignant
flibberdyjibbard
vista as in "look at that stunning vista!"
Numpty
Dreich
Carnaptious
Recalcitrant
My homunculus is called "Recalcitrant".
And my penis.
I'm particularly fond of cromulent words that embiggen the language... 🙂
glaikit
Biffon.
flange
I'm regularly measuring the inside diameter of flanges with my bore gauge...
trunnion is another fave
Nomenclature
Oxymoron
Also amused by Americans who address you as "sir" when asking directions to Edinburgh Castle (other famous tourist sites are available).
Spiffing
Ejaculated
meaning Utter suddenly
used in some sherlock Holmes books see examples below
Watson ‘ejaculates’ twice as often as Sherlock Holmes in Conan Doyle’s stories. There are 23 ejaculations in total, with 11 belonging to Watson. On one occasion, Holmes refers to Watson’s ‘ejaculations of wonder’ being invaluable; on another, Watson ejaculates ‘from his very heart’ in the direction of his fiancée. Homes is only responsible for six ejaculations, although it is not clear which of the two men ejaculate in the passage below:
So he sat as I dropped off to sleep, and so he sat when a sudden ejaculation caused me to wake up, and I found the summer sun shining into the apartment. The pipe was still between his lips, the smoke still curled upward, and the room was full of a dense tobacco haze, but nothing remained of the heap of shag which I had seen upon the previous night.
The Man with the Twisted Lip, 1891
flange
When bored I teach other people's kids that flange is a swear. They go back and start calling their simblings it. Endless fun. 
Just William shocked me by ejaculating several times in one book.
Incredulity : is my offering.
gudgeon pin
" Homes is only responsible for six ejaculations, although it is not clear which of the two men ejaculate in the passage below:"
Is this a euphenism ?
Is this a euphenism ?
look it up in a dictionary and there are two meanings
A Gudgeon is also a tropical fish*. A smallish unassuming fish, which it turns out** can eat anything up to about 1/2 of it's size. Including some of my favorite ones 🙁
You may not be surprised to learn it comes from Australia.
An Empire Gudgeon
[img] 
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*And also some Marine fish share the name
**My LFS did not know this until I brought her back. Fatter.
Draconian
Callipygian - meaning shapely buttocks
Thingummyjig
Doodleflop
Howsyourfather
I sometimes have trouble remembering words...
Ultracrepidarian
Really should get more use, plenty of opportunities in this and many other internet forums.
Crapulent. Not a word that there aren't plenty of alternatives for, but it's got "crap" in it, so, y'know..
Zugzwang
also
Floccinaucinihilipilification - the estimation of something as valueless
not one for the kiddies 😉
Heiromania
Shag carpet.
inertia
integrity