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Regarding Avocado Toast
(lemmy.dbzer0.com)
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.
I'm pretty much in the middle of the "millennial" range, and my understanding is that it was something people mainly made at home. Only when it became more popular did I start seeing it on menus.