Wow--cool! I'll be the first one to tell you this, and you'll be grateful to me forever!
It's a dream in which you become aware that you are dreaming--and then you can do whatever you want!
Well, that's the goal anyway. Sometimes the control is a little harder than that, but it's almost always really fun no matter what. Maybe you've had dreams like that before occasionally; some people have them naturally, others have to practice. It's one of the main goals of most people here at DV, and a pretty fun hobby.
So look around here some, read the tutorials. That should give you a good idea of what a lucid dream is and how to have one. A good book is "Exploring the World of Lucid Dreaming" by Stephen LaBerge, if you're interested.
Anything else, feel free to ask! Have fun!
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