Derived from the abbreviation MD. When a douche in pre-med tries to explain medical things they don't even understand. Often M-Douches like to pretend they are already doctors, performing half-assed surgeries in basements. M-Douches are not to be trusted and are to be reminded of their M-Douche status frequently.
Guy 1: I don't feel so well
Guy 2: You definitely have cancer
Guy 1: Shut up you M-Douche idiot
Guy 2: Yo I'm pre-med!
When an absolute idiot thinks they understand something medical or health related and goes crazy explaining it over their social media. In reality they'll probably end up with mega-AIDS with their terrible ideas, so medsplainers are to be avoided and feared. Someone can be a medsplainer, can medsplain, or medsplaining.
My sister tried to medsplain to me that onions in my socks will cure cancer and now my stupid socks smell like onions.
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