Hyper-aggressive openings

The OP has asked the wrong question. You should be asking about the soundest openings for black! I just giggle when black tries to play too aggressively and carry on with my development, if I fall into a trap, so be it....

I thought Black was simply losing in that position. Anyway Black is winning pretty easily after 9... Qf5 so it's a moot point. (And others will say the Muzio is a moot point because White has better than Bc4 and Black has better than g4 and such... but I think the Muzio is fun.)

I agree, the muzio is typically how I refute the king's gambit, though i've tried other ways with success.  I just favor more aggressive gameplay.

For black, there are aggresive opening choices, but white has to be willing to cooporate for them, if you want them to be somewhat sound. There is Najdof, Winaver, Marshall, Traxler, KID, Bennoni, Grunfeld to some part as well. The biggest problem is that you need two to tango!

Come to think of it there more in old lines of the King's Gambit for Black.

White avoids the Muzio:

And personally, but only in Blitz games, I enjoy the incredibly unsound Nxe4 in the mainline 2 Knights Defense.

then watch this: http://www.chess.com/video/player/how-to-crush-your-opponent-in-the-kings-gambit----part-1 (kings gambit)

sorry i dont have a premium membership and need an opening for black

Though certainly not sound, the list of extremely ultra hyper aggresive gambits might include something along the lines of; The Nakhmanson Gambit, The Muzio Gambit, Cochrane Gambit, Traxler Counterattack, Jerome Gambit, Irish Gambit, Vampire Gambit.