Similar to a troll, a forum rat is someone who has spent so much time on an internet forum site, such as Gametrailers or Gamespot, that they start to use the usual forum-like mannerisms in real life. Whether intentional or not, this is not a good thing. It could have originated from term mallrat.

A completely forgettable message board user. Somewhere there is most likely a factory churning them out by the thousands. You'll know you're in the presence of a forum rat when you read a post and get the sudden strong feeling that you've read the exact same post before. Main characteristics of a forum rat:

-Infrequent or nonexistent use of capital letters and/or punctuation.
-Bizarre behavior and use of the English language, which is often described as either ghetto, otaku, forum female, fanboy, or even l33t d00d, or a combination of the above.
-Avatar consisting of an anime or video game character, animated sprites from Metal Slug or Final Fantasy, or the forum default Homer Simpson picture.
-Username consisting of at least five numbers or underscores.
-Huge, ugly Photoshop abortion of a signature which may stretch the page frames.
-Terrible or nonexistent lack of personality
-Completely worthless, typical, or irrelevant opi...