creeping along in a line of 5 mph traffic, he pulled into my lane of 50 mph traffic, a regrettable move of unparalleled dumbassity
"it is bold and it is really [dumb]
"creeping along in a line of 5 mph traffic, he pulled into my lane of 50 mph traffic, a regrettable move of unparalleled dumbassity" What is the definition of "dumbassity"?