Tooltips in bootstrap are good, but there is also a very good tooltip function in jQuery UI, which you can read about here.
Example:
<label for="male" id="foo" title="Hello This Will Have Some Value">Hello...</label>
Then, assuming you have already referenced jQuery and jQueryUI libraries in your head, add a script element like this:
<script type="text/javascript">
$(document).ready(function(){
$(this).tooltip();
});
</script>
This will display the contents of the title attribute as a tooltip when you rollover any element with a title attribute.