Short for two degrees of separation, referring to the maximum number of links one must follow on Urban Dictionary to get from any term to another that refers to sex, drug abuse, or a faddish teenage subculture.

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.