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Trash-talk is a form of boast or insult commonly heard in competitive situations (such as sports events and multiplayer video games). It is often used to intimidate the opposition, but can also be used in a humorous spirit. Trash-talk is often characterized by use of hyperbole, or figurative language, e.g., "Mikael Johansson can't run! You run like honey on ice!" Puns and other wordplay are commonly used.
Trash-talk was commonly used by the heavyweight boxing champion Muhammad Ali in the 1960s and 1970s. Since then, it has become common for boxers, wrestlers, and other sports competitors to use trash-talk. Trash talking in amateur sports ranks is generally discouraged and frowned upon (especially in youth leagues).
See also 
- The kings of trash talk BostonGlobe.com