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.
1. (non-pejoratively, uncommon use) Sharice is committed to protecting the environment, and if she has to drink the kool-aid to do so, then so be it.

2. (pejoratively, common use) Karen is so crazy that she's investing money in Sears and for some bizarre "reason" thinks that they will be "restored to their former glory." She's sure into drinking the kool-aid.
by BurnHeal April 10, 2020
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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.
p1: "Wanna start a cult?"
p2: "I'm not drinking the kool-aid"

p1: "Dinosaurs could all fly and were secretly dragons"
p2: "Wow you really drank the kool-aid huh?"
by NovaTheGreatAndPowerfulCult January 13, 2020
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Assimilate into the upper eschelons of corporate culture, at the expense of your soul.
Jack is really trying to get ahead at work. He doesn't hang out with the rest of the slackers, any more. I think he's been drinking the kool-aid.
by Duh!Vinci August 24, 2006
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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.
If they beleive that, they must be drinking the kool-aide.
by bluzcrazy April 25, 2006
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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.
"You've been at that company too long and they treat you like crap. It's time to stop drinking the kool-aid."

"He's been volunteering for that political campaign and it's all he talks about. Half of it is BS ... I wish he'd stop drinking the kool-aid."
by CatsAtTheKeyboard February 13, 2020
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To completely buy into an idea or system, whether good or bad.
Coach Bellichick got his players to drink the kool-aid.
by Some Guy February 5, 2005
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Guy 1: That new substitute is soo cool!
Guy 2: Man, quit drinking the kool aid. :-/
by CM Oreo June 6, 2004
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