Drinking the Kool-Aid
"Drinking the Kool-Aid" is an expression commonly used in the United States that refers to a person or group who goes along with a doomed or dangerous idea because of peer pressure. The phrase often carries a negative connotation when applied to an individual or group. It can also be used ironically or humorously to refer to accepting an idea or changing a preference due to popularity, peer pressure, or persuasion. In recent years it has evolved further to mean extreme dedication to a cause or purpose, so extreme that one would "Drink the Kool-Aid" and die for the cause.