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."
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