I'm bulimic and just vomited out blood? Wat does it mean, is it bad? Were blood come from?

It's not good. A physician might be able to determine the source of the blood. But it is also very important to treat the bulimia as soon as possible. Cbt therapists are often quite successful at helping with this eating disorder - especially those who specialize in it. Get help now! good luck and take care of yourself.
Hematemesis. It could be from your stomach, your esophagus or your upper respiratory area. If you are vomiting blood - please seek medical care now.