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Luna-Porn (noun) A term that refers to the random posting of porn on a chat/forum site for little or no reason. It origins is unclear but it first appeared on a chain of Forums and has since spread throughout the internet. More commonly than not refers to hentai.
Used in a chat: "Hello" "Hello" "(Porn Picture)" "Dude, whats with the Lunaporn?"
by HolyCrapOfGod April 01, 2010
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