Abut: abut is not a miss-spelling of ‘about’, or of ‘a butt’ (as in water butt); nor is it a clumsy reference to part of human anatomy. If a building or area of land abuts something or on something, it is next to it or touches it on one side. https://dictionary.cambridge.org/dictionary/english/abut
Bluff: Used as an adjective – to call someone ‘bluff’ means they are good-natured and bluntly outspoken. It is not to be confused with the noun meaning a steep cliff, nor the verb ‘to bluff’ or its associated noun, which relate to deception through pretence.
Double-clutch shift: I don’t know if it is still the practice, but in the old days, with a very heavy vehicle, it put a strain on the gears to shift straight from one gear to the next. The practice was to shift from one gear into neutral and then from neutral into the next gear, raising and lowering the clutch separately for each stage. There might also be some strategic pressure applied to brake or accelerator to adjust engine speed according to whether driver is shifting up or down in gear. In a large truck with air brakes it gave a very distinctive pattern of hiss-thunk sounds when slowing and thunk-rev sounds when speeding up.
Of course manual gearshift isn’t the everyday driver’s experience these days.
Nakkerin: An animal that has been castrated has, in the slang of my Aussie childhood, been ‘nackered’. (I am unsure of correct spelling, and unfortunately, the term is missing from the Australian Slang Dictionary at https://manofmany.com/culture/advice/australian-slang-dictionary). However, I did find the following suggested confirmation: ‘”Knackers” is also a British/Australasian vulgar slang for testes, although this usage may be derived from nakers – small medieval kettle drums which were typically played in pairs suspended from a belt around the waist’. https://en.wikipedia.org/wiki/Knacker
Pan: ‘pan’ refers to the toilet bowl. It derives from ‘sanitary pan’, a large can used to collect waste back in the days of the ‘backyard dunny’. In urban areas, the sanitary man drove his truck by each household once a week, to exchange the full can for a sanitised empty one, through a special little door in the back wall of the outhouse. Many a tale has been told of being caught in the midst of proceedings, sitting over a hole in the bench seat, when the receptacle beneath was whisked away by the sanitary man.
Querring: a made up word based on the ‘querr’ sounds made by mating possums – onomatopoeia.
Scolled: Skol means “cheers” in Swedish. To skol is an aussie adaptation/adoption meaning to swill a glass of liquor. I came across this word in another narrative recently, but it was spelt ‘scolled’, as above, not as Midgley spells it below.
Linguist Daniel Midgley weighs in on the ‘skol’, ‘skull’ and ‘scull’ debate
https://www.abc.net.au/listen/programs/perth-breakfast/is-it-skol-scull-or-skull-a-beer/101371156
Spakfillered: ‘spakfiller’ is a well known brand name of an easy-to-apply water-based filler used in building repairs to fill cracks and holes in interior surfaces prior to painting. ‘spakfillered’ is a made-up word that refers to the thickness of Miss Muggins’ face make-up. In context it is descriptive, intended to place her within a category of mature, heavily made up women of her ilk.