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Atrumption - noun 1 The confident assumption of something with no proof, usually delivered as absolute fact. 'In a classic case of atrumption, he declared Tylenol was behind the rise in autism' 2 The habit of claiming to know more about a subject than anyone else alive. 'Her atrumption peaked when she said she knew more about medicine than doctors, economists and her mum combined' 3 The belief that if you say it loudly enough, reality will bend to your will. 'It was pure atrumption when he insisted windmills cause cancer. 4 When assumption and performance art collide. 'Suggesting he was the healthiest person alive at 78 wasn't medical advice, just good old fashioned atrumption' (Thanks to Anti-Clickbait Society 2.0)
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