Have you ever seen this in an opening?

This has to be the wierdest opening I've ever seen. I didn't play correctly but neither did my opponent and I was able to win.

I missed nxd4 on move eight, and instead checked with the queen, planning to sac the bishop or take with the pawn after g3 but he didn't play g3. It was dubious but it worked out.

http://www.365chess.com/search_position.php

Here was the idea...

But he didn't play g3. I thought it was an interesting novelety but I can't find it anywhere. Of course after queen takes g7, rook to e8 I'd lose the queen but I wouldn't play that, I push the pawn, take with check, or check him with the bishop.

My point is that 7...nxc3 takes isn't anywhere to be found in the vienna game but I just don't see how it's bad for black. I'm probably missing something.

Looks like he was going for an old school Vienna game type of set-up. Check out this cool retro game.

Cool game ^

I have absolute no idea what that is about ^. 

He couldve captured a free knight But instead he just let him escape and prevent mate....

What free Knight? 4. Nxe4 is met by 4. ... d5

For a change lerk, as he calls himself at the moment, gives a relevant equalising line, but don't expect any explanation, that would be too much .

A more interesting line for black is 5...Nc6 as in http://www.chessgames.com/perl/chessgame?gid=1102845. Nunn explained this game in one of his books, but forget which.

Well then he'll just take pawn with bishop then he'll be a pawn up in material..

??? How would he be a Pawn up? This sequence started with BLACK capturing a Pawn on e4. White would just be getting that Pawn back, not winning a Pawn... and he would be losing Bishop-for-Knight plus a tempo (the Bishop moves twice and disappears from the board, Black's d-Pawn only moved once before disappearing).

White gains no advantage in the line you mention. Live with it.

There are two ways to trade a Bishop for a pawn in that position, the line I think you're discussing with blueemu, and 4. Bxf7, which a lot of people play in Blitz after seeing the fork. Both are bad. Some players have a hard time believing 4. Bxf7 can be bad because it removes the opponent's ability to castle, but that's White's good Bishop and you're giving up the center that way. 4. Qh5 on the other hand, also aims to get the pawn back (you can see at the end of 6 White is ready to regain the pawn) but without the loss of the Bishop pair. ... or Black can hold the pawn and play the Frankenstein Dracula but in that case White can still get the pawn back plus a rook if White wants to play into it. 4. Qh5 is the mainline for a reason.

And what does any of this have to do with my game?

In response to the OP, you did not miss 8...Nxd4?! Because of 9.Qd3! and White is better after both 9...Qh4+ 10.Kf1 and 9...f3 10.Bxf7+ Kxf7 11.Nxf3 Nxf3+ 12.Qxf3+ followed by 13.cxb4 with advantage for White.

It's the opening you played and asked about.