I have a multibit wallet I created a few weeks ago and fat fingered the password after I transfered the bitcoin I found that out! I tried every password I could think of and then some..
I assume there is no getting it back?
That depends on how much you remember about the password... if it's long enough and you don't remember much or anything about it, there's pretty much no chance.
If you do remember a lot about the password, you can try to use a tool that will go through various combinations to recover it. One such option is btcrecover (I'm the dev of that tool, so naturally I'm biased), it's a free & open source password recovery tool you could try. You will need to do a bit of reading to get it set up and running though. The Tutorial and the Quick Start are here:
https://github.com/gurnec/btcrecover/blob/master/TUTORIAL.md#btcrecover-tutorialIf you have any questions about it, feel free to ask.
There are also people in the Services forum who offer assistance with password recovery, so you could check there too.
Good luck...