Complete; utter (used to express annoyance or contempt):a blithering idiot...
Through some strange process of absorption, many otherwise intelligent individuals become blithering idiots under the barrage of abuse that is pledging.
I will quickly write something intelligent tomorrow to atone for the blithering idiot I am tonight.
You aren't the blithering idiot the past few have been, and I have this feeling that you're not racist.