"Dinger" is Australian slang for condom.
The beanie that Maxine wears is of the Port Adelaide Power Football team (Australian Rules).
"Dimmies" (or dim sims) are a take-away food item, usually sold by Chinese restaurants and 'fish-and-chop' shops. They are dumpling-style dish, consisting of a meat and/ or vegetable mixture in a dumpling style wrapper, and are either by deep-fried or steamed.
When Kane refers to Darren "singing' f*ckin' Sadie", he is referring to the song 'Sadie the Cleaning Lady' sung by John Farnham, an Australian singer. The song was a major hit in the 60s and is an iconic track in Australian music.
The clown's description of her ex-boyfriend's career as a puppeteer using his genitals would seem to indicate that he was at some stage part of the 'Puppetry of the Penis' performance show.