When cum dries on your skin, and it looks like scales.
"Wow, Rumpelstiltskin you've got some scaly cumskin, bro."
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Using one's cum as ink and one's dick as a pen.
"My boyfriend was dick writing on my boobs the other day, he came so much I thought he was writing the Declaration of Independence on them. All I could make out was his John Hancock."
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