Drinking too much, too quickly. This is done until one is at the point where he is shouting nonsequiturs at the blender and mumbling sweet nothings to the fat chick in the corner who has done nothing but pout and eat pretzels since she arrived.
Guy 1: Oh man, I can feel a bout of aggressive drinking coming on tonight!
Guy 2: That is such a bad idea.
Guy 1: I'm sorry, I couldn't hear you over the sound of my impending glory...