I'm rolling up my catnip and shitting in your litter
She’s simply rolling up a joint and smoking it in your personal space.
It’s a metaphor implying that Kreayshawn can do whatever she wants… because she’s RICH, BITCH!
FYI: nepeta (aka catnip) has the same effect on cats as weed does on humans: euphoria; hence the term “cat-nip”.
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