When you take a dump and there is no toilet paper left and your parents have friends over, you are forced to look through the bathroom trash can to find the small remains of previous rolls to wipe with.

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.