The term "trash" has several meanings, depending on context.
1) In a general sense, trash refers to worthless or discarded materials, such as garbage or rubbish that is typically thrown away.
2) In slang terms, the word can be used to describe something of poor quality or value, for example: "That movie was total trash."
3) In a more specific sense, trash refers to a type of sports commentary where an athlete performs well beyond expectations, often in defiance of their previous performance. For instance, if someone says that a basketball player had a great game and "put up some trash," it means they played exceptionally well.
4) In the world of professional wrestling, trash talking refers to the practice where wrestlers insult each other or their opponents in order to get themselves psyched up for a match.