When douche bag doesn't quite illustrate the magnitude of someone’s douche baggery.
1: Did you see Brian wearing 5 popped collars at once.
2: Yeah, he's a douche bag.
1: No, douche bag ends at two popped collars. Five at a time makes you a douche tanker.
2: Fucking spot on!
A sense one comes across after many years of experience of knowing douches. This sense makes you able to detect if a person is douche or not by looking at their clothes/listening to how they talk/ect.
I used my douche detection skills when I heard a car speed off on the residential street outside my window. He was defiantly a douche.