A way of thinking that you (or someone else ) are prideful of an idea or thing to the point of complete stubbornness and unwillingness to change their opinion on the subject matter
Ben: The American public is showing a concerning amount of Proudthought, specifically with the ability to recognize that America isn't the bestcountry.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi