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Another addition to the "dere" family of characters in the Japanese entertainment industry/otaku subculture. "Uso" means to "lie", so when combined with "dere", it would mean that a person being categorised as an "usodere" would be a compulsive liar.

This term first appeared in Japanese eroge "Usodere!" released by Nounai Kanojo on 18th December 2009.
She is an usodere because she always lies.
by YennoX December 25, 2009
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