I've seen this sticker in at least two places around the University District in Seattle, Washington. I don't know how long they've been around.
The image portrayed in the picture appears to be a person pointing a pistol. Is it a white person? Are those sunglasses, or shadows on the eyes? Is it supposed to be "The Man"? Then there's the title of the sticker, "THE LAST GREAT LIAR." This is a sticker that makes me wonder. I don't know what the "message" is, if there is one. But it's fun to look at and imagine new meanings.