An over privileged piece of shit that continues to live with their parents long past their welcome, is overly dependent on their parent's resources, and acts like it is their right to do all of this

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.