A happy valley is a ‘place’ where people go when they are stoned/high. It’s a place where things spin, things are happy, very vibrant colours appear, and there are a lot of different terms for this but the most common is definitely a happy valley.
There are a few meanings for this term, some of them being inappropriate.
However, it is mainly to describe what kind of ‘world’ people enter when they become high on drugs.
“Apparently Lacey got high, and she kept saying that she was in the happy valley. We weren’t quite sure what that meant.”
“Oh, its the place where people go when they’re stoned, everything spins it’s very vibrant and happy! Tell her to be careful.”
The grundle of the world. Depressing little hole that should be filled in. Accesible only by long, long dirt road or even longer boat ride: "voyage of the damned". Home of the chocolate weavils.
I would soon contort and defacate in my own ear than return to happey valley/goose bay.