What is back bitch double?

When a person texts you an emoji and you don't know how to respond, so do a back bitch double (by sending back an emoji)

Person 1: omg she did me so dirty!!!
Person 2: *cat laughing emoji*
Person 1: *Laugh crying emoji*
Person 1 to Person 3: "Omg I did a back bitch double to Person 2!"

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back bitch double - video