A common euphemism a girl may use for the act of fingering herself. Similarly, "painting her nails red" can sometimes refer to a girl fingering said cooter whilst she is menstruating.
guy #1: "So what's Sally up to tonight? Is she gonna chill with us?"
guy #2: "She said she's just staying in and painting her nails tonight. How fuckin' boring is that."
guy #1: "This is like the 3rd time this week she's blown us off to paint her nails, how many times does one person need to paint their nails?"
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