a greeting or exclamation said with an exaggerated high pitch, sass, enthusiasm and emphasis on the "haaay." Often used to indicate sexiness or a vivacious attitude.
Mary: Wow, your hair looks great today.
Susan: You like it? I just cut it.
Mary: Oh Hay!
Susan: Oh HAAY!

Kelly: I have a date tonight
Jessica: Oh HAY!

If a girl in a bikini appears it would be proper for her to receive a chorus of "Oh HAYs" from her friends.
by SMCC July 29, 2011

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