It's likely that the intended word was "furiously". This word describes something done with extreme energy, passion, or anger.
Here are some examples:
* "The waves crashed furiously against the shore."
* "He argued furiously with his opponent."
* "She danced furiously to the music."
If you provide more context about where you encountered the word "fusiously", I might be able to give you a better idea of what it was supposed to mean.