Past tense of 'dacker'; acted in the manner of dacking, or in Australian slang, pulled down someone's pants as a prank.
From 'dacker' with the regular past tense suffix '-ed.' In Australian context, possibly from 'Dacca' (fine cotton) or a shortened version of 'ducks,' creating the verb form.
The Australian slang use of 'dacker' is a perfect example of how schoolyard pranks get immortalized in language—the term 'dackering' became common Australian schoolboy vocabulary, showing how each generation and region creates its own informal verbs.
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