Humanity: Fuck Yeah. Usually describes a thread on the /tg/ board on 4chan in which neckbeards go to explain how jawesome humanity is. Basically hundreds of pieces of copypasta in which humanity is insane and kills everythingeverywhere at all times for any reason ever.
Ever.
I was in a H:FY thread on /tg/ in which someone said that, if it is alive, we willfuck it.