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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.
An ex and I used to jokingly sing "avocados from Mexico" because that was an advertising jingle, and she definitely ate avocado toast all the time. We broke up in 2013, so it had to be kinda popular before then.