When someone doesn't wipe their ass after taking a massive dumparoo. The easiest way you can tell someone has a muddy bum is by seeing shit-stains on the rear of someone's pants

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.