After a bit of searching, the most plausible answer seems to be that kiki is Dominican slang for money, "yo no tengo ni un kiki" would mean more or less: I don't have a dime / I am poor. read more
In the song she says "I got one kiki" and then she says "I got my kiki" and I was just wondering what it meant. Oh and the song is called "Loca" ft. Dizzee Rascal. read more