A Mexican standoff is most precisely a confrontation among three opponents armed with guns. The tactics for such a confrontation are substantially different from those for a duel, where the first to shoot has the advantage. In a confrontation among three mutually hostile participants, the first to shoot is at a tactical disadvantage. If opponent A shoots opponent B, then while so occupied, opponent C can shoot A, thus winning the conflict. Since it is the second opponent to shoot that has the advantage, no one wants to go first.
In popular usage, the Mexican standoff is sometimes used to refer to confrontations with only two opponents when neither side has an advantage in conceding property or by attacking first. Discussions of the Soviet Union – United States nuclear confrontation during the Cold War frequently used the term, specifically in reference to the Cuban Missile Crisis of 1962. The key element that makes such situations Mexican standoffs is the very close equality in power among all involved. The inability for any one party to advance their position safely is a condition common to any standoff; in a Mexican standoff, there is additionally no safe way for any party to withdraw from their position, making the standoff effectively permanent.
In financial circles, the Mexican standoff is typically used to connote a situation where one side wants something, a concession of some sort, and is offering nothing of value. When the other side sees no value in agreeing to any changes, they refuse to negotiate. Although both sides may benefit from the change, neither side can agree to adequate compensation for agreeing to the change, and nothing is accomplished.
This expression came into usage during the last decade of the 19th century; the Cambridge Advanced Learner's Dictionary makes an unattributed claim that the term is of Australian origin. Other sources claim the reference is to the Mexican–American War or post-war Mexican bandits in the 19th century.
The earliest print cite to the phrase was 19 March 1876 in a short story about Mexico, an American being held up by a Mexican bandit, and the outcome. "Go-!" said he sternly then. "We will call it a stand-off, a Mexican stand-off, you lose your money, but you save your life!" 
||This section may contain excessive, poor, or irrelevant examples. (May 2013)|
- Spaghetti Westerns (notably the iconic denouement of The Good, the Bad and the Ugly but has also been used elsewhere)
- Reservoir Dogs (Quentin Tarantino)
- Pulp Fiction (Quentin Tarantino)
- True Romance (Tony Scott)
- Inglourious Basterds (Quentin Tarantino)
- Hard Boiled (John Woo)
- Training Day (Antoine Fuqua)
- The Matrix (The Wachowski Brothers)
In video games
The ending of the video game Call of Juarez: The Cartel features the protagonists engaging in a Mexican stand-off. This then leaves the player(s) to decide whether or not to kill their teammates. Also the game Call of Juarez: Gunslinger features Mexican standoff involving Silas Graves - fictional main character - Sundance Kid and Butch Cassidy.
In the 2010 video game Red Dead Redemption, almost every multiplayer match begins with a Mexican standoff to determine which player or team gets an early advantage. Also, the single-player story features a Mexican standoff between John Marston, Landon Rickets, Herr Mueller, and some banditos over Mueller's false accusation that Marston was cheating. Rickets refers to it as "an impasse" after John asks if there is a name for the situation, the joke being that the characters are in Mexico when this occurs.
- "Mexican standoff", The Word Detective, retrieved 2013-03-21
- Sunday Mercury(New York),19 March 1876, p. 2/col. 5
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