Just "I need help" or "I need some help". It could mean a couple of things, depending on the context. Most commonly though, would be to spray or run out of something (usually very fast). "When he turned the tap on, the water fired out the hose". "If you make some smoke at one end of the burrow, the rabbits will fire out the other end".

give the sentence where you found it

What??? I'm sure I only pressed 'submit' once!