Here are the most common meanings of "ream":
* A quantity of paper: This is the most common meaning. A ream is a standard unit of paper, typically containing 500 sheets.
* To enlarge a hole: This is a more technical meaning, referring to the act of using a tool to make a hole wider.
* To scold someone harshly: This is an older, less common meaning, and is not typically considered slang.
If you heard "ream" used in a way that seemed slangy, it's possible that the word was used incorrectly or in a humorous way. For example, someone might say "I'm gonna ream you!" as a joke, meaning they're going to scold someone or give them a hard time.
If you can provide more context about how you heard the word "ream" used, I can help you understand its meaning.