Hideki Tojo was the Japanese Prime Minister who ordered the attack on Pearl Harbor. "Tojo" became the personification of the "evil Japanese" in anti-Japanese propaganda during WW II. His caricature was often shown in posters with outsized ears, squinty eyes and enormous buck teeth, "thanking" Americans who failed to recycle metal, wasted food or did other things that were detrimental to the war effort. He also appeared in several pretty racist Warner Brothers cartoons. After the war (and Tojo's execution), "Tojo" pretty much died out as an anti-Japanese slur.
Tojo says "thanks for throwing away that can"! (Americans were supposed to recycle steel cans to support the war effort)