Mike Sorrentino, a.k.a. The Situation from Jersey Shore, may be as full of himself as any man who has ever lived. So important was Sitch, in the mind of Sitch, that his nickname had a nickname and everything he did had to be an acronym or catch phrase. Many of which were hilarious, granted. But still ... total douche.
Dean McDermott has really entered the upper echelon of this category since his cheating ways have been exposed and recounted ad nauseam on True Tori.
Most people considered d-bags are male, but when you are universally disliked, obnoxious, full of yourself and synonymous with "Momager," well, you're in the club, Kris Jenner.
Adam Lind of Teen Mom 2 is basically a terrible boyfriend, father, and human being in general who has tormented Chelsea Houska (and viewers) from the get-go on the MTV reality staple.
Juan Pablo Galavis
Definitely the biggest douche ever to be named The Bachelor, and one of the biggest in all of reality TV history.
One word says it all: JEAH.