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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>sub — private method</title>
  <style>body{font-family:sans-serif;padding:16px} pre{background:#f1f5f9;padding:12px;border-radius:6px}</style>
</head>
<body>
  <pre id="out"></pre>
  <script src="https://code.jquery.com/jquery-1.8.3.min.js"></script>
  <script>
    (function () {
      var lines = [];
      var sub$ = jQuery.sub();
      sub$.fn.myCustomMethod = function () {
        return "just for me";
      };
      lines.push("sub$: " + sub$("body").myCustomMethod());
      lines.push("global $ method: " + typeof jQuery("body").myCustomMethod);
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
</html>

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jQuery.sub() — private method (Try It)