Weird Gambit Opening

So this is the first time I've ever tried this. I've been meaning to for a while now and I figured this would be a good chance. Black had already beaten me as white the game before. I figured I had nothing to lose.

Well, with this gambit, I won in 8 moves. Unfortunately, I can't analyze it as it's under the number of moves required to have a game analyzed. Take a look and tell me what you think.

http://www.chess.com/livechess/game.html?id=20593424

5...Nxd5 6.dxe5 Nd4 and you're a piece down.

Right, that's why it's called a "gambit." I was prepared to be a piece down for the game in exchange for pulling his king out and destructing any opening he planned on -- including a castle.

I didn't plan on the quick-mate; that only happened because of his mistakes. I think, though, that if the game continued with me one piece down, I would have been able to construct a better game.

Just a hypothesis. Clearly at 1338 I don't know much about chess which is why this topic is here.

Yeah, that makes sense now. I tried the opening a few more times and just ended up looking like I'd never played a game of chess in my life.

I guess I just got lucky.