Bad is a group power that, when assigned, allows you to add your own custom bad words to the filter for your chat. This power also comes with bonus smilies.
To add custom bad words, assign this power to your chat group. Find Bad in your group settings and enter your custom bad words into the box, separated by commas with no spaces. For example: word1,word2,word3. Then click "save" at the bottom of the page.
Note: Words have to be 4 or more letters.