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Tiu is a Chinese word in the Cantonese dialect that literally means 'penis'. However, its most common use is not as a noun but as a verb. To 'tiu' someone thus means 'to use the penis on someone', or to 'fuck someone'. Due to this usage, the word 'tiu', when taken as a noun, has morphed to mean 'fuck that' and used in a somewhat similar way to its English counterpart.
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