When someone you know had a chance to do something that took balls to accomplish and won't go attempt to do it. Instead of pussying out he Vag'd out.

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.