A San Diego listener of Mexican descent says a scene in a Quentin Tarantino film has her wondering about the term Mexican standoff. Is it just a duel? A three-way duel, complete with guns? The end of a 1-1 doubleheader in baseball? Over time, it’s had all of these definitions. But the term appears to derive from a derogatory use of Mexican to describe something inferior or undesirable. This is part of a complete episode.