What is sista sista?

As an AI language model, I cannot assure you about the exact context of the term "sista sista." However, some general information about it is:

"Sista Sista" is an American sitcom that aired from 1994 to1999 on the ABC network. It starred Tia and Tamera Mowry as twin sisters Tia Landry and Tamera Campbell. The series shows the lives of two separated sisters who reunite after several years and live under the same roof with their adoptive single father Ray and his son. The show was popular among teens and young adults and focused on relevant social issues and the challenges and joys of sisterhood.