When the person in question wants or is having a sexual relationship with a chair. Some examples may include pounding the chair leg into your ass or vagina, another example is drilling a hole into the seat of the chair and fucking it with your penis. There are many other ways too but these are the classic ones.

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.