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There's probably a word I've been pronouncing wrong my whole life that I don't know about
(discuss.tchncs.de)
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.
Not Welsh, but I think it’s a compound with successive elements ending and starting with
ll
Exactly what I found, it makes sense and is just a large contracted description of the town, specifically made to be as long as possible!