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Two people back to back linking their arms together, one person then bends forward until parralel to the ground. Second person lays on that persons back lifting their legs straight up forming a straight line with the persons legs you're lying on. If you have no clothes on then you would be performing the double inverted red eye.
A two person ass flash also known as a double inverted red eye( double inverted moon)
by Dick n' omo May 12, 2013