a word said in a high pitched, annoying voice when passing bye a stranger in the supermarket to see his or her reaction. Basically, just a way to mess with people. Usually accompanied by a quick flashing of the palm with the elbow bent at 90 degrees.
What a girl who has a boyfriend uses after you say “hey” to her online. the question mark indicates that she was being a rude bitch and wants to let you know that she’s bothered by the fact that you tried to be friendly with her.
Me: I found this cute girl on Facebook, I’ll say hey to her and maybe we can talk afterwards.
Me:(says hey to her)
Her: Hi?