How to disable middle click paste Mavericks Terminal?
You can use Karabiner (formerly known as KeyRemap4MacBook) with the following setting in private.xml:

&lt;?xml version="1.0"?&gt;
&lt;root&gt;
    &lt;appdef&gt;
        &lt;appname&gt;Terminal&lt;/appname&gt;
        &lt;equal&gt;com.apple.Terminal&lt;/equal&gt;
    &lt;/appdef&gt;
    &lt;item&gt;
        &lt;name&gt;Disable middle-click&lt;/name&gt;
        &lt;identifier&gt;private.disablemiddleclick&lt;/identifier&gt;
        &lt;only&gt;Terminal&lt;/only&gt;
        &lt;autogen&gt;
            __PointingButtonToKey__ PointingButton::MIDDLE, KeyCode::VK_NONE
        &lt;/autogen&gt;
    &lt;/item&gt;
&lt;/root&gt;