So in the select2-drop widget, where it displays all options in the dropdown, I want it to display a tooltip description for each option that I hover over.

Here's what I've done so far within the inlinejs property under a widget name using the suggestManyDirectory type, and it doesn't work. I have inserted this code inside the foldable box widget, within a bold containerLabel inside the inlinejs property.

jQuery(document).ready(function() {
    jQuery('ul.select2-results').tooltip();
    });

And Firefox firebug gives me an error:

TypeError: jQuery(...)tooltip is not a function

How can I fix this?