when you see someone that you do not like and havent seen in a great while of time you say "hello paul" (guy) or "hello paula" (girl). You can also cringe and twist your neck for exclamation.
Nancy: "Oh hello Devon! I haven't seen you in such a long time!"
Devon: (Twisting Neck and cringing) "Hello Paula."
Nancy: "My name's Nancy..."
Devon: "Oh right..."