Chinpoko means "penis" in Japanese. During the South Park episode of Chinpokomon, the Japanese claimed to have a very small penis. Therefore,I'm sure you can all see the hidden humor now.
When South Park did a parody of Pokemon, and the Chinpokomon wehe used to get the kids to bombPearl Harbor. The Japanese leaders get the government (including Clinton) to think the Japanese were harmless by saying that Japanese couldn't take over because the had small penises and the Americans had "mammoth penis. Just happy to be in room with big Amaerican Penis."