Motorcycle Question

So why do they have their own secret wave? When I went to Ft. Worth on Thursday I thought one of them was going to wreck, would have not been a good. Why don't they wave to me? I like motorcycles. I used to ride all the time. Can't they see that through my tinted windows or bug guts infested windshield? I would like to start my own special hand wave (other than the guns up) for geeks who drive Fords trucks, live in a house too small for all their stuff, like to fish, and enjoy being lazy. Any suggestions?