This is an infamous "crafts project" that involves making a card from a Land O Lakes box. The box she is holding up is converted into a flap that, when lifted, reveals her tits. (The "breasts" are actually made from her knees using the image from the back of the box.)
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Dude/dudette, that shit is like a million years old. I thought it was passed down from generation to generation. Not like I have anything better but, thought I would just chime in cause I can't to show my nephew how to do it!