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adventitious, adjective, appearing accidentally or unexpectedly — eg, When Jeremy saw that Troy, a teetotaller, had mistakenly entered the pub, Jeremy said "Random!", to which Troy replied "Adventitious!"
birl, verb, to cause anything to rotate rapidly; to spin (a coin in the air or on the table); hence to toss a coin on the table as one's contribution to a joint fund, to contribute one's share — eg, Joshua birled his $2 coin into the pot as he placed his bet
cucking-stool, noun, an instrument of punishment formerly used for disorderly women, fraudulent tradespeople, etc, consisting of a chair, in which the offender was fastened and exposed to the jeers of the bystanders, or conveyed to a pond or river and ducked — eg When the customers realised Jones had scammed them, they placed him on the cucking-stool and ducked him into Lake Burley Griffin
didapper, noun, used pejoratively, someone who disappears for a time and suddenly reappears — eg When Troy saw Thomas was back online, after nearly a month's absence, Troy called him a didapper
discission, noun, an incision into the eye — eg When Thomas heard what Troy had said, he grabbed a knitting needle for the purposes of an impromptu discission of Troy's eye
diversivolent, adjective, desiring strife or differences — eg Arthur is constantly being diversivolent about Troy's Facebook posts for reasons Troy can still not understand
ebriection, noun, mental breakdown from too much boozing — eg After Jess and Andrew had one of their drinking sessions, Andrew had to comfort Jess through her latest ebriection
elapidate, verb, to rid or clear (a place) of stones — eg Troy needed Catherine's help to elapidate the area around their favourite picnic bench
electuary, noun, a medicine mixed with sugar and water or honey or other sweetener into a paste suitable for oral administration — eg When Ericka got sick, she added sugar to her cough medicine to make-up her own palatable electuary
engastration, noun, the action of stuffing one bird inside another — eg For Carol's special dinner, Wendy followed an old engastration recipe, comprising 6 whole fowls
esculent, adjective, suitable for food, eatable — eg Carol discovered quite by chance that the berries in her garden are esculent
eumoiriety, noun, the state of being happy as a result of being good — eg When Gordon started teaching Troy bad habits, Troy was no longer eumoirous, but started feeling good for entirely different reasons
flabellation, noun, the act of fanning — eg When Tom showed Cindy shirtless pictures of himself, Cindy needed to cool down with some emergency flabellation
frippet, noun, a frivolous or showy young woman — eg When Bec got her excellent mid-year exam results, she was certainly no frippet; she was instead gracious and humble
fustigate, verb, to beat with a stick — eg When Mr Lopez went to the Christian Brothers' school as a child, Mr Pickham would fustigate him almost daily
galeanthropy, noun, the delusion that you have become a cat — eg Troy wanted to please Christopher the cat lover so much that he wished himself into a state of galeanthropy
gambrinous, adjective, being full of beer — eg Jeremy blames the Queensland heat for his being always gambrinous
glebous, abounding in clogs — eg, While in Sweden, to satisfy her shoe fetish, Beryl went to the clog warehouse, which was certainly glebous
gynotikolobomassophile, noun, someone who likes to nibble on women's earlobes — eg, Tim decided to go out with Julia because of her giant earlobes; finally, someone to satisfy his gynotikolobomassophilia!
setigerous, adjective, having bristles — eg, Dylan hadn't shaved for a while and looked quite setigerous
Peter Bowler, The Superior Person's Second Book of Weird and Wondrous Words (2003)
Oxford English Dictionary Online
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