In simple terms, it's called 'passing note'. It's an ancient art form that is used only by those of us who lack the current technology to text their freinds. Ye Olde Texting is used primarily by females and flamboyantly gay teen boys.

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.