What does it mean when you throw up after an intense workout?

ultimega
I've always seen it on TV when like someone who hasn't worked out before throws up but I wouldn't know the reason.
In my case, I do workout and had done three sessions back to back. So when I woke up this morning the first thing that happened was sweating then I threw up. No food came up just mainly water... is that normal?
This has never happened to me before...
What does it mean when you throw up after an intense workout?
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