Bird purring is a sound made by humans and is rarely heard in the wild. The technique one must master to create this sound is known only by a few, but the legends say it's similar to the sharp Norwegian R. Bird purring is used for many things, such as avoiding silence, asserting dominance, letting your presence be known and show emotions like happiness and confusion.

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.