Toxic member of the fandom of the KPop girl group TWICE. Play on the fandom name of ONCE and pronounced "Dunce".
"That DONCE needs to shut up. She's making us look bad."
by BigBlueagain February 26, 2022
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This is a portmanteau or blend of the words 'dunce' and 'nonce'. It means not only is the person a nonce, but they are a fucking idiot too.
Did you see that guy on twitter admit to shagging a 16 year old?

Yeah, what a donce!
by ScrimshawSudoNiM September 13, 2022
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