When you're givin 'er the beans in the back of your '92 mustang, and you beat her over the head with a skateboard and start slapping her ass cheeks like a pair of shitty bongos like you're in a 3 star cuban resort mariachi band.

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.