Informal or dialectal term, possibly related to 'gizzard' or used as slang for an unspecified object or gadget.
English dialect: possibly a shortened form of 'gizzard' or other dialectal words; origin uncertain, may be regional British or Australian slang.
Gizz is one of those wonderfully vague dialect words—like how Brits say 'thingy' or 'whatsit' when they forget a word, except gizz seems specific to certain regions, and we're not entirely sure what it means.
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