When you take a wet towel and drag it down the crack of your ass to leave a dark brown streak of shit and ass hair. The towel is then usually strategically placed in the laundry hamper so that when someone reaches in to fetch the dirty laundry, he or she can't help but get a handful of ass in the process.

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.