A crystalline tropane alkaloid also known as cocaine. The derivation of "white salmon" coming from the idea that those that use cocaine tend to have runny noses. In inhaling the white powder, one can image the powder going upstream against the flow of the runny nose....as salmon do. Convoluted? Perhaps. Ingenious? Quite.

A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.