Ezequiel lesson, part I: Green Go! = gringo

I got it from one very wise co-worker of mine that the etymology of the word gringo originates from the Mexican-American war. As the story goes, American troops - dressed in their green uniforms - were occupying Mexico City when they began to encounter resistance from Mexican nationalists. These nationalists used as their rallying cry "Green... Go!" because they wanted the American soldiers dressed in their green uniforms to go home. Thus, the moniker "gringo".