Look up chach. But this is a conjuction of chach which means the person who is a said chach is more and/or less then a chach seeing as though they have a hole in them. Or this is a person who is a chach but they try to be a non-chach, if you will.

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.