Hay-Hay: The loving and funny name I call my sister...it is essentially the nice way of calling her stupid. She is not, in fact, stupid, just blonde...and not always the sharpest tool in the shed. I love you Hay-Hay
you say this to greet a friend, especially one you have many inside jokes with. also, this is used to seem showy and cool that you have a friend you can pronounce as loudly as most people say this
Betsy: OH HAYYYY
Camily: HAY GURL HAY!!! whats up??