An erection so massively huge that it stretches and pulls the skin from your face, causing a tooth-bearing grimace and bleeding from the corners of the eyes where the thin skin tears. It requires such a large volume of blood for engorgement that there is shunting away from the head and brain, resulting in dizziness and tunnel-vision, frequently progressing to loss consciousness, convulsions, and sometimes frank coma and death in the worst case.

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.