Negative rep just means people are too pussy to pursue an argument with something you said and they know it. So, they have to "kook" you to make themselves feel better. Because clicking a button is some powerful shit. You don't want to fuck with the power of the kook.
Edit: Anyway, when you become a Slap Pal after reaching 1,000 posts (those are the names in blue that you see), your user rights are upgraded and you'll see a "kook" and "gnar" button on people's posts. As for the reason you're getting kooked, no idea. There are some cunts lingering around here.
Kook me motherfuckers.