It is a Cubanism for "tomorrow", with some Afro influence in its ending. It is of festive and colloquial use, surely associated with other meanings such as "spell of African religions", or a nickname that over time became a name and surname, both surely from mama-nganga ("guide woman in the palo monte religion").
* Only one "like" per meaning and day, the more "likes" the meaning will appear higher in the list
