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In Australian English, dinkum means fair, honest, or genuine. You almost always meet it in fair dinkum: 'Is that fair dinkum?' means 'Is that really true?' and 'That's not fair dinkum' means 'That's not honest.' Fair dinkum can also mean 'the real thing, not fake,' and as an adverb, 'truly.' It is friendly, very Australian, and a little old-fashioned now, though people still play with it. A dinkum bloke is a straight, trustworthy man. British dialects in and Lincolnshire had the word too, a little later. Nobody knows where it came from. The first clear record is Australia, 1879, in the phrase fair dinkum. It might be related to an old ding, 'to work hard,' but that is only a guess — so there is no family we can stand behind.
老實的、真正的（澳洲英語，常說 fair dinkum）
組成Origin unknown. Earliest clear use is Australia, 1879, in fair dinkum; also recorded a little later in some English Midlands dialects. Perhaps related to Gloucestershire ding 'to work hard,' but that is only a perhaps.
原始詞典資料3 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
dinkumadj/ˈdɪŋkəm/
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slangGenuine, true, honest, on the level.
- Hon. Sir Ross McLarty: We were always dinkum. Mr. MAY: The ultimate result showed how dinkum the hon. member was.
- The dinkum Aussie everyone talks about, almost always with a certain unreal sentimentality, is clearly a worker.
dinkumnoun/ˈdɪŋkəm/
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obsoleterareslangHard work.
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datedslangTruth.
- You look real jockey — thats' the dinkum.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。