1)When one of your roomates drinks the last
beer in the fridge, and chugs it in front of you, laughing diabolically, while (he/she)finishes with a beltch
2)When you are driving and someone pulls out in front of you, causing you to slam on the brakes and blow the
horn, as well as possibly causing you to exert excess energy to raise you third phalange (your middle, or "fuck-you" finger)
In both instances you think "fuck, what an asstard...this dick needs to
fuck off," thus making the asstard a "fuck dick"