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1.
When you are as high as humanly possible. It doesn't matter what drugs you are intaking, as long as you are high as hell.
John: How was your night?
Jack: Dude, I was as High as I could fly.

John: Hey did you hear about jack?
Mary: Yeah, I was there. He was as high as he could fly.
by XBOX OVER WOMEN November 21, 2010