What on earth does "Your all alone" mean?

What is the word "Your" referring to? Your what is all alone? I saw that nonsense posted on here and I tried asking the poster what it meant but (s)he wouldn't explain in a sensible and logical manner. How are we supposed to respond to such a nonsensical post?

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lostlissa · 36-40, F

It's no fucking big deal. We all knew what it meant.

KarenKC · 56-60, F

@lostlissa How did you "know" what it meant? Please explain in a logical manner without resorting to swearing.