Don't forget to update your Tampermonkey!
 

You need to add the https protocol now that GFY has activated it.

Here is the code in yellow:

// ==UserScript==
// @name gfy.com
// @description block threads, posts, etc from certain users
// @include https://gfy.com/*
// @include http://*.gfy.com/*
// @include https://gfy.com/*
// @include https://*.gfy.com/*
// @require https://code.jquery.com/jquery-1.7.2.min.js
// @version 1.0
// @grant none
// ==/UserScript==