The story of their visit quickly spread among the ‘gringo Trail’ and McFadden lucked into a business as the unofficial tour guide.
After that, backpackers on the South American ‘gringo Trail’ began touring and partying in San Pedro.
1849, from Mexican Spanish gringo, contemptuous word for "foreigner," from Spanish gringo "foreign, unintelligible talk, gibberish," perhaps ultimately from griego "Greek." The "Diccionario Castellano" (1787) says gringo was used in Malaga for "anyone who spoke Spanish badly," and in Madrid for "the Irish."
In Latin America, a foreigner, especially a North American or Englishman; usually a term of contempt.
English people or Anglo-Americans: gringo, used contemptuously by Spanish-Americans (1849+)