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A woman's whiney version of the common "Okay". Often used as it is believed to be flirtatious. It isn't. It's annoying.
Can also be said in exasperation when giving up in an argument
Boy: "Hey girl want to go see the avengers tonight?"
Girl: "Okaaayyyy"

Boy: "No we are not going to Twighlight again"
Girl: "Okaaayyyy"
by texasbride May 11, 2012