Retard

A word originally found in the dictionary, and used as a generic term for those who are mentally handicapped. This word has now become taboo and considered a social faux-pas for the usage of those with mental disabilities, due to advancements in mental exploration and the explosive usage of the word as a negative term for those who venture from the "norm" in any way, in so much as wearing the wrong shirt or saying the wrong thing, in everyday society. It has even become a pop-culture word used to describe people who do foolish or say foolish things, whether the person stating the term is using it in a jovial or malicious way (between friends or just to be a total jerk)