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It's an abbreiation for the phrase "Ultimate Mind Fuck". It can have 2 possible meanings: 1. when 2 people unite mentally as well as physically during sex. This is implicated in the 1993 song "UMF" by Duran Duran. The terms "UMF" and "Ultimate Mind Fuck" are not in the lyrics. 2. brainwash, mass deceit, censorship, when several people (as in a cult or an entire nation) are mentally manipulated and hoodwinked and led astray by propaganda, corruption and outright lies and absolute bullshit.
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