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1.
Short for "Ah, OK." Meaning, "I heard that but I could care less." Often said in online chat.
girl1: "So I got an A on my test today!"

girl2: "Ahok."

girl1: "....."
by HCUser June 11, 2010
 
2.
It's a way of showing that you are not interested in someone's opinion or what s/he said does not appeal to you at that particular moment.The one who says this uses a rather sarcastic tone to express his/her disinterest in the topic.
Faddy: Hey,I just saw Avatar on 3D....it was awesome!

Gabby (really doesn't give a damn about the movie): Ah ok! What time is it right now?

Faddy: Dude,you are not interested,that's not cool,you are changing the topic now.
by DonDjibril April 15, 2010