Originally a male kazakh name, then turned into derogatory term. The word targets people with very poor russian, lack of proper education, constant spitting and swearing in Kazakh and Russian, talking in a south kazakh dialect (e, maa, zhyndy, olya etc.), and mostly targeted to people who came from a villages. They usually dress in a sport clothes, but also just really simple clothes. The word mambet targets both genders.
"mambet syakty zhurme!" Don't act like mambet
"Ol zherde tek mambetter zhuredi, baska zherge barayik" The place is full of mambets, let's go somewhere else.