diff --git a/plugins/replace_word.py b/plugins/replace_word.py
new file mode 100644
index 00000000..6abb1702
--- /dev/null
+++ b/plugins/replace_word.py
@@ -0,0 +1,46 @@
+"""
+Replace some word with some other word in a message before sending it.
+
+
+Installation
+------------
+You only have to load the plugin.
+
+.. code-block:: none
+
+    /load replace_word
+
+Configuration example
+---------------------
+.. code-block:: ini
+
+[replace_word]
+# How to appear casual in your daily conversations.
+yes = yep
+no = nope
+
+Usage
+-----
+Just use the word in a message. It will be replaced automatically.
+
+"""
+
+from plugin import BasePlugin
+import tabs
+import re
+
+class Plugin(BasePlugin):
+    def init(self):
+        self.api.add_event_handler('conversation_say', self.replace_pattern)
+        self.api.add_event_handler('muc_say', self.replace_pattern)
+        self.api.add_event_handler('private_say', self.replace_pattern)
+
+    def replace_pattern(self, message, tab):
+        """
+        Look for a given word in the message and replace it by the corresponding word.
+        """
+        body = message['body']
+        for before in self.config.options("replace_word"):
+            after = self.config.get(before, before)
+            body = re.sub(r"\b%s\b" % before, after, body)
+        message['body'] = body