She bit my neck, would kiss me 'til my lips sore
Clothes smelled of Gucci with a little hint of thrift store
First line is rather self explanatory: she would bite his neck (perhaps in a promiscuous manner) and would kiss him until his lips were sore.
The second line saying that her clothes were expensive, such as Gucci clothing, but they came from a thrift store as she didn’t really have the money to buy those clothes if they weren’t used.
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