drinking the kool-aid

1. (non-pejoratively, uncommon use) To fervently subscribe into a cause or belief with passion and energy.

2. (pejoratively, common use) To heavily buy into a cause or belief that is utterly doomed to failure and disgrace with complete disregard to all reasoning, evidence, and intuitions that clearly indicate such a result. Referring to an inability or unwillingness of someone to be persuaded out of believing obvious nonsense -- even when confronted with the facts -- often times out of a sense of loyalty to a group identity even if there is no reason to do so. Generally implies the complicity of an individual or a group of people in their own deception irregardless of whether or not they realize it.

refers to accepting something blindly without thought or criticism.
Linked with Cults and mass poisonings.

The phrase “drinking the Kool-Aid” refers to followership at its worse. It was coined after a delusional, pseudo-guru named Jim Jones led his cult, the Peoples Temple, to mass suicide. Over 900 people, including 304 children, killed themselves by drinking from a vat of grape-flavored drink laced with cyanide.

Assimilate into the upper eschelons of corporate culture, at the expense of your soul.

To blindly follow, or believe something or someone without even questioning the facts. Refusing to agknowledge the real truth. Believed to have connections to the Reverand Jimmy Jones cult that committed mass suicide by drinking kool-aide spiked with poison.

A figure of speech that means to buy into the ideas or beliefs that someone else is selling, be it a company or a church. It strongly suggests that the ideas are nonsense and possibly dangerous. The phrase is a reference to the Jonestown massacre in which the cult leader Jim Jones led his followers to commit mass-suicide by drinking a poisoned fruit drink similar to Kool-Aid.

To completely buy into an idea or system, whether good or bad.

To blindly follow someone or something.