A person who is very attractive, radiates a glow, a druggie and an alcoholic who seems so sweet and kind, but is really a liar and will always cheat on their girlfriend no matter what because it is in his blood.

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.