[ec2-user@ip ~]$ mysql -h servidortest -u meuusuario -p
Enter password:
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mysql> use databaseteste;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> show grants;
+-------------------------------------------------------------------+
| Grants for meuusuario@%                                           |
+-------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'meuusuario'@'%'                   |
| GRANT ALL PRIVILEGES ON `databaseteste`.* TO 'meuusuario'@'%'     |
+-------------------------------------------------------------------+
2 rows in set (0,00 sec)

mysql> GRANT INSERT ON `databaseteste`.* TO 'usr_mage_fol'@'%';
ERROR 1044 (42000): Access denied for user 'meuusuario'@'%' to database 'databaseteste'

string(320) "SQLSTATE[HY000]: General error: 1449 The user specified as a definer ('usr_mage_fol'@'%') does not exist, query was: INSERT INTO..

mysql> select user, host from mysql.user;
+--------------+------------------+
| user         | host             |
+--------------+------------------+
| meuusuario   | %                |
| usr_mage_fol | %                |
+--------------+------------------+