Filters are a simple yet useful system to replace text. They can be applied to incoming or outgoing IRC chat.
Just go to Prefs->Filters and setup your own.
- Replacement - The text you want to replace with
- In - If checked, it'll be applied to any incoming IRC chat
- Out - If checked, it'll be applied to any outgoing IRC chat
Note that the filters are applied from first to last, only once.