Toxic member of the fandom of the KPop girl group TWICE. Play on the fandom name of ONCE and pronounced "Dunce".
by BigBlueagain February 26, 2022
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.
by ScrimshawSudoNiM September 13, 2022