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Compared to fountain pens and ballpoints, "Sharpies" are actually the least sharp pen type.
(self.showerthoughts)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
It seems that the etymology isn't on Wikipedia. I'd assume the name is in reference to sharp lines that you can write or draw with it.