the score on gamefaqs.com your username gets. you earn 1 karma for each day your account is active. higher karma amounts allow you to post more messages per day, have access to more social boards, bragging rights, etc... You lose karma when one of your messages gets moderated, the amount lost per message depends on the severity of the violation and how much of an d-bag the moderator is.
that asshole mod gave me a 3 karma loss for my topic!!!