She gave me all her pills
Now my back hurts

from The Weeknd – The Birds (Part 2) Lyrics on Rap Genius

Meaning

The pills she gave him were likely ecstasy, which enhances sexual pleasure and when consumed excessively causes the depletion of spinal fluid and therefore back pain. [But you only realise when you are coming down, as when you are high you are comfortably numb].

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