Put Beyonce on the line and make up some bogus shit
Like "You dont rub the back of my knees right so this marriage is over with and the ring thats on my finger. Guess what? Im throwin it *cling* .. And you heard the sound so you know I did."
from Kendrick Lamar – Beyonce Lyrics on Rap Genius
Meaning
He wants Affion to impersonate Jay-Z voice while on the phone with Beyonce. Affion(Jay-z) will tell her that the marriage is over so that she will break up with Jay-Z for real. Then Kendrick can come and scoop her up.

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