Hi I fought against headshot24 in public jousting today and I had an epic fight but I forgot to save it, could someone retrieve that for me please?
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Headshot42 is his name.

No one can retrieve it, ITS GONE!
you have to be more car full
you can go to setup,options,advanced and tick auto save replays

Well unless someone in the server happened to randomly save that replay, its gone like scorpion said. So I guess you could pm the people in the server but I don't think they would of saved it.

So there is absolutely no way to get that replay?

No, there is not. Unless someone else saved it like the others suggested.

Where do my autosaves go?

In your replays folder, C: \Games\Toribash-4.1\replay

nope
it saves on toribash foldar path\autosave
like:dtoribash\autosave