"Brully" is not a recognized word in standard English. It could be:
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A misspelling of "bully": This is the most likely explanation. "Bully" refers to someone who uses force or threats to intimidate or control others.
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A regional slang term: It's possible that "brully" is a slang term used in a specific region or community. Without more context, it's difficult to determine its meaning.
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A made-up word: It's also possible that "brully" is a made-up word used in a fictional context, like a book or movie.
If you have more information about the context in which you encountered "brully," it would be easier to determine its meaning.