Help with English language, please

[Deleted]

Hello everybody, this question haunts me from time to time but I haven't asked it ever.
An expression like "that's what I did" as in a Tracy Chapman's song Fast Car: "so I quit school and that's what I did" was also used in the Live from London dvd, with Andy saying something very similar in the interview. Maybe he said "left" instead of "quit" but the "that's what I did" part is there.
Now if I have to translate it literally, it makes sense - more or less - still nobody would say it in Italian, or any other language that I know.

So could anyone please tell me when such an expression is used and whether it can be translated?
My impression is that this is a way of saying which, as such, might also be overlooked in the translation, but I'm not sure.

Thanks very much in advance to whom will reply.

[mynick7]

First, that phrase isn't grammatically correct.  It isn't even a correct sentence.  Like so many sentences, some things get shortened.  That's what happened here.

Basically, they are reiterating/emphasizing that they did something (i.e. quit school, job, etc.)

Does that make sense?

[Deleted]

Now it makes more sense, thank you!

[mynick7]

You're quite welcome!