Deletion of .frm .MYD .MYI files
Well I guess you just deleted the database's data files (.myd) and the database's index files (.myi) from your database server. To top it off you deleted the *.frm file which are also part of your database.

One reference I came across: Normalize Table File Name Extensions
Another reference describes what you did manually: What happens when you drop your database
The full reference can be found here: MySQL Glossary

I do hope you have a backup of your database?