During anal sex, just before the man orgasms, he sticks his finger up his own ass then shoves it into the unsuspecting girl's mouth, inducing a violent gag reflex, causing her anus to tightly grip the man's shaft for a magical experience.

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.