Does the phrase "Nails scratchin' my back tatt” is some kind of metaphor?
"Nails scratchin' my back tatt" is actually an example of a sexual innuendo. The rapper is alluding to the act of sex, describing the action of when the woman scratches his back (or back tattoo) when they are having sex. You will notice other context clues when looking at the song title ("Bad Things") and listening to the rest of the lyrics, which also describe the same act in other ways.
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