an adaptation of the popular MLE term “bun” meaning disgusting or gross. bewn (pronounced b-oo-n or b-ew-n) is commonly used to refer to anything that’s bad. very creative.
BEWNER is "boner" pronounced with a Ukrainian accent (or the accent of the lead singer from Go Go Bordello), popularized by Egoraptor in the Gamegrumps play through of Shadow a Of The Collosus.