That's a domination move. He sees you as one of his hens and is trying to be in charge. Not necessarily aggression, but it could lead to that. When my young roos start doing this, I immediately pick them up and give them wuvvies (pets and snuggles) to let them know I'm bigger and in charge (and that I'm not intimidated by them). In fact, my year-old Buff Orpinton roo, Gerard, still gives me the wing dance, but I just pick him up and say, "Oh, sweet boy!" and hold him and give him pets. If your roo does start coming at you, don't take off. Stand your ground and maybe even 'charge' at him - so he knows you are the dominant roo. The suggestion to wear jeans and boots is a good one. Hope this helps!