A popular, fast-acting, back-door virus that can be planted on one's computer in under 3.5 seconds. Commonly found on all Mozilla Firefox, Safari, or any Windows system.
Person 1: Hey man, have you heard about this new site called Tumblr? I've never been on it.
Person 2: Do not go on it! I tried to and a virus shut down my computer. I had to call geek squad, but they couldn't fix anything. I'm fucked!