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cacker
undersized crayfish, crab or marron: You keep those cackers and I'll dob you in. Also, kakka.
Contributor's comments: "Cacker" or "kakka". An undersize crayfish (common around Cervantes and Lancelin, and also in Perth fishing circles): "They were (illegally) selling cackers at the pub."
Contributor's comments: Yep, I know this word from Geraldton (big crayfishing town) and Perth area.