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"Fry" is an ambiguous word in English
(lemmy.world)
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.
And the most common use of the fish version is to describe a person or animal as a "small fry" when comparing them to another similar group.