Meaning the alternate ego of the original person, this type of person often wears their glasses on the back of their heads to pretend to have a second face, and use this as a fake ass emergency contact

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.