How to use the Jquery Multi module?
Why you did double code wrap?
Try to use: 

(function($) {
    "use strict";
    $(document).ready(function() {

        /* *********************** */
        /* Mobile only Hamburger menu       */
        /* *********************** */
        $(".masthead .menu").on("click", function() {
            $(this).toggleClass('menu-close');
            $("body").toggleClass('menu-open');
            $(".masthead ul").toggleClass("animated bounceInDown");
            $(".masthead .tap-back").toggle();
       });
              });
})(jq213);