You've been here before, girl
Remember these sheets
The girl that Abel is getting high with tells him she has been high before, that she’s used to this drug and she’s already experienced what he is trying to show her.
He tells her she hasn’t been on this type of high. The “sheets” can refer to bed sheets or the sheets that clouds look like once you are flying in a plane.
This could also be a reference to any girl he’s ever spoke about in a song, as Abel is no stranger to keeping a girl around, but also suggests she is more than just a random conquest because he’s been with her more than once.
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