jQuery snippet that makes bootstrap's dropdown menus slide. stolen from: https://gist.github.com/jalcine/3013002#comment-840867

bootSlide.js

$(document).ready(function() {
  $('.navbar .dropdown').hover(function() {
    $(this).find('.dropdown-menu').first().stop(true, true).delay(250).slideDown();
  }, function() {
    $(this).find('.dropdown-menu').first().stop(true, true).delay(100).slideUp();
  });
});