People say it's photoshopped because there is a version that was photoshopped to look even more like the woman and the giraffe. The regular version still looks like it, but not as much.
Of course, it's hard to tell if the version you posted is it or not because either way once you see it, you can't unsee it. <____<
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http://img.imgcake.com/AitchDeeTee/panicdancegifta.gif
http://backloggery.com/herodeltiempo/sig.gif