Swahili slang word, exact meaning is "your moms pussy". It might not make sense however in the swahili it has a deeper meaning. As Tupac said in one of his songs "Fuck All Yall Niggaz In Swahili" he probably meant to say "Kumamako". In Swahili language it means "fuck you" to another level. Say this to any random swahili speaking nigga and see what happens to you.
A man cuts off a swahili speaking man on at highway, the brother rolls down his window and yells out "Kumamako!"