I know this is from College Humor which is usually, despite what its optimistic name implies, not very funny... this video is amazing. Gamer girls get revenge on a dudebro giving them grief in a video game. [warning - soooo much hilariously bad language]
This does make me glad I don't play multiplayer games, though. *goes back to playing Borderlands* Oh Claptrap, you scamp.
(Oh god, I have no idea why the video is so big. I'm so sorry. *shakes fist at the sky* Kinja!)