(Canada, genericized trademark) A type of folder with three prongs that is commonly used to store papers in elementary school settings.
One of the students is really messy — his worksheets are always falling out of his duotang.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.