Sanchez is a synonym for an anonymous mexican person. There are 6 other such synonyms for mexican person: Juarez, Juan, Rodriguez, Gonzales, Fernandez and Santiego. When using these synonyms in scentences, you can either use them by themselves or in pairs. (Juarez Gonzales over there is being lazy).
"you know why theres a giant wall in florida?" its because of all those damn sanchezes sneaking across the border"