The !ignore command tells the bot to effectively ignore you. It will no longer accept messages for you, nor will it allow people to use the !seen command on you. However, if you issue a command to the bot, it will respond.
OvEn ToAsT (3:28:05 PM): !ignore
toasts aim bot 0 (3:28:58 PM): Users may no longer send you messages, use the !unignore command to reverse this.