Yes, it can also mean that. You could also say, "I met a certain girl just the other day". But that would sound unnatural since English, especially nowadays, is a very lax language. You could use it, but it is rarely used by the majority. But I wouldn't explicitly suggest that you should not use it, since a little quirkiness is always appreciated.
@sinog I see. Then feel free to say "I met this girl the other day". But there's also a slightly more relaxed manner to say it, just in case you might be talking to someone and they said, "I met a girl recently", it means they're basically saying the same sentence you were asking about.
Yeah. When someone uses "this" in the way you described, it sounds a bit like they're trying to make the listener imagine a girl (in our example) in order to make their anecdote feel more concrete or understandable.
Sometimes we say things like "They have this big machine that has all these parts..." and make gestures the whole time we're explaining the machine.
I remember a scene from the old animated Aladdin movie, where the genie is asking Aladdin how he can really help him, and Aladdin says, "There's this girl..." as if he's having trouble articulating exactly what his situation is.
Thank you for your specific and detailed explanation. What you are saying is that the use of "this" in the sentense gives the impression that I know exactly who it is, but for some reason I am not saying it clearly.
@us4gi Well, everyone is a storyteller of their own story in one way or another. I mean, not everyone has the tendency to speak like a storyteller, for me I'm just doing it because it is fun also it helps me to keep track of the things I say.