Is there a such word as accusatory? For example: You are being very accusatory.
Yes. Accusatory is a good word and you've used it correctly.
http://dictionary.reference.com/browse/accusatory
i need help with this subject
Yes, the word "accusatory" does exist. It is an adjective that describes someone or something that is making or characterized by accusations. In your example, "You are being very accusatory," it means that the person being referred to is making a strong and direct accusation.
If you ever come across a word that you are unsure about, one way to find out its meaning and existence is by using a dictionary. There are many online dictionaries available, such as Merriam-Webster, Oxford English Dictionary, or Dictionary.com. You can search for the word and get its definition, pronunciation, and examples of usage.
Another option is to use a search engine, like Google. Just type in the word you want to know about, followed by "meaning" or "definition," and you will find various sources providing the information you need.