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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. A showerthought should offer a unique perspective on an ordinary part of life.
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.