Top Definition
The dissonant male-specific mental state of being both (a) distressed at having gone bald, but also (b) delighted that you've gone bald because you were previously ginger. A chronic form of the classically ephemeral cognitive dissonance, McDonaldism affects around 2% of men worldwide, and 73% of men in Scotland.
See that 40 year old guy who's trying to have sexual intercourse with age-inappropriate, attached women? He's only behaving that way because he has McDonaldism.
by Lancaster's Second Finest August 12, 2011

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