Here's a description of the game from the website than my own explanation:

www.Forumwarz.com is a parody role-playing game that takes place on the Internet. In fact, Forumwarz is the Internet...in game form.
Magical dragon-faeries? Flaxen-hair'd elflords? Dank scary dungeons, reminiscent of Grandpa's basement? Kids' stuff. In Forumwarz, you can pwn trolls in ridiculous web forums...buy hacked warez from shady Russian websites...or upgrade your skills with breast implants, malt liquor and antidepressants.
Assume the role of one of three Internet personas: Camwhore, Troll or Emo Kid, each with their own special attacks, abilities and personalities.
Play in story mode and pwn your way through a dense world of mystery, intrigue and Internet idiocy. Or test your skillz against others in various player-versus-player challenges.



Forums are dungeons and indivindual threads are mosters. You fight against a thread by pressing one of your attack options. "Banging your head on your keyboard witha helmet on" is a basic attack.

Instead of seeing your character slash at a monster you get to see your avator post a reply on the thread you're attacking. The bang head attack shows a reply of gibberish.
In later levels you get "magic" attacks depednding on your character class. I'm a cam whore so I get attacks like a boobs picture post.

Forum threads attack back with their own replies lowering your ego bar which equate to hit points.

There are other basic rpg elements like shops, character upgrades, items, quests, side missions, and npcs.

The beauty of the game is that you play as someone who is fighting against the internet as someone that people usually hate on the real internet. The humor is freakin awesome too!