When you walk by a girl who has a great ass OR if a girl shows you her amazingly sized and shaped ass, and you are feeling quite enthusiastic, then you may raise your hand to your forehead and give the ass a salute. It is one of the most respectful gestures you can make toward a woman
Jimmy: Yo did you see Alexis' ass last night
Billy the kid: Yeah she showed me and I gave her an Ass Salutation. Then she showed me her puss
Jimmy: What the FUCK!!!!! She only shows that to guys that she wants to fuck
Billy the kid: I smashed. She has a huge clit dont worry. It would never fit your egg shaped cock!