pee-pee /ˈpiːpiː/noun 2verb 1forms 4 noun2 •(informal) Urine. •(informal) The penis or vulva; genitalia.A pee-pee for making Wee-Wee. — 1980 verb1 •(informal, slang) To urinate. formspee-peed · pee-peeing · pee-pees · pee pees