Medsplain
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.