When you have four fingers in the vagina and your thumb in the belly button and then pulsate. Slowly getting tighter and squeezing until you are able to touch your thumb with your fingers.

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.