To chatter, tease, or talk persistently; Australian slang for friendly mockery or banter.
Possibly from imitative 'chack' or 'chatter'; Australian English origins, likely 20th century. The word may derive from English 'chack' (to chatter or make noise) combined with '-y' or have onomatopoetic roots.
Australian English is full of these colorful slang terms—'chyack,' 'reckon,' 'mate'—and many came from British English but got reinvented with new meanings in Australia, showing how English dialects develop their own personalities across different countries!
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