Empty (spent) nitrous oxide canisters, 'whippits', or cream bulbs often discarded and left lying around on the ground at music festivals or technivals where this is a popular drug of choice. The term originated from the observation that they resemble the faeces of robots, being both metallic and the shape of a passed stool.

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.