I get pretty terrified of people attacking me for saying something wrong, so I tend to delete something I was about to say. I don't exactly have the greatest way with words, so an anonymous post where no one knows I'm not trying to be a jerk can be a bit difficult to handle.
I tend to think left 4 dead's Boomer zombie.
Slightly unrelated but when people say Zoomer, I often think about the hover bike from the first Jak and Daxter. XD