Mexican slang
The act of attempting to fool, deceive, or make fun of another individual. This word gets its roots from the word, 'chamaco', meaning child, kid, or youngster in coloquial spanish. It thus means, to be fooled like a child, to be made fun of or taken advantage of because of one's own innocence or naivite.

Derivates:
chamaqueado - male, and chamaqueada - female, to have been made fun of/fooled/decieved.

chamaquear - to make fun/fool someone.

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.