To adorn unnecessarily something already beautiful. The expression is a condensation of Shakespeare's metaphor in King John: "To gild refined gold, to paint the lily ... is wasteful and ridiculous excess." i.e., you wouldn't need to add gold to a beautiful lily.
Jennilyn is so beauitful that putting on makeup is just Gilding the Lilly.
by _Andy_ June 24, 2006
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To gild something is to cover it with gold. A nice vagina looks like a flower. So when a woman wants to go take a piss she'll call it "Gild the Lilly" when in mixed company.
Hey Dan, while a girl will Gild the Lilly I will ( see a man about a dog).
by St. Peter Dickinson February 26, 2017
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