The shit on your teeth after a long night of drinking. Typically you wake up and rub your tongue over your teeth and realize they are somehow covered with fur.

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.