That Rihanna rain just won't let up
She’s using the metaphor that rain keeps pouring in on her life. In other words, bad things keep going on in her life. Maybe also a play on one of her older singles, “Umbrella.
(One could also use rain’s homophone, “reign” to explain this line: she could say that she will never stop ruling, no matter how long her detractors wait for her to “let up”.)
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