Giko Neko (ギコ猫), often simply called Giko, is a seminal figure in Japanese internet culture, originating as a Shift_JIS art character on the anonymous message board 2channel in the late 1990s. Typically depicted as a cynical white cat, Giko became famous for the catchphrase 'Itte yoshi' (行ってよし), roughly translating to 'You may go' or 'Get lost,' which was frequently used to dismiss annoying posters or signal the end of a conversation. Alongside other characters like Monā, Giko helped define the unique aesthetic and humor of the early Japanese web, evolving from simple text characters into a broader cultural icon that appeared in Flash animations, merchandise, and indie games. Today, Giko remains a powerful symbol of nostalgia for the foundational years of online community building and anonymous board culture.