This command allows you to send a message to any user who has user mode +w set. While only IRC operators can send a wallops, any user can set +w and thus receive them. Wallops usually serve little purpose. For IRC operator only communications, you should join a network staff channel or use globops instead. For communications with all users on the network, regardless of user modes, use global instead.
Wallops takes 1 argument, the message to be sent. To send a wallops with the message "Hello Ravenchat", use the following command:
/wallops Hello Ravenchat