What does "Sing it, sister" mean?
“Catey, listen to me. I love Mills and Billy, and we totally bonded while we were making the movie, but you have to understand something about both of them—they’re actors.”
Everyone in the room said “Uh-huh” and Kenz added, “Sing it, sister.”
“Of course they’re actors,” I said. “That’s why they’re in the movie.”

Question

Answer

It is slang. You can say it to someone to show that you strongly agree. Of course, if you are saying it to a male speaker, you would say "Sing it brother!"

Other similar expressions are "Tell it like it is!" and "You said it!" or "You got that right!"

Answer

It means "I agree with you." In a slang-y way.

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