I would like to add my vote to git-er-done as a better use of the slang, if that had been used I think it would have gave a better starting tone to the rest of the post. Git-er-done I know is slang and have heard it quite a bit, well related to the guy that started it, but no where else. To me get it done is not slang it is a demand at least when used the way you do it. Used the way you linked where it is used not so much with a job or something that needs to be done but related to an object or person it would have at least stopped me for a moment and made me think about it.

"In game email Get it Done!" is totally diffrent from "That girl Get it Done!". The first is a demand to drop every thing else and just do it no matter the cost. The other is well I would have been scratching my head and doing as you said asking what you meant.