(For men) When you sit down to take a shit when you're cold - when your flaccid penis has shrunk to where it no longer hangs down like normal - and the defecation triggers urination which is released in a horizontal, outward stream that goes all over your floor.

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.