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1. noun Disparaging, insulting, or abusive speech aimed at a person, group, or thing. I think the trash talk between boxers before these big fights is just the dumbest thing in the world, but I know some people who love it.
2. verb To speak in such a manner (about someone or something). As a verb, the phrase is usually hyphenated. The senator trash-talked her opponent for most of the debate, all but avoiding the actual issues at hand.