Stuff
This is my stuff.
These are my stuff.
Is it ok to use "These are" with stuff which is uncountable noun? Is it understandable to point out some things and say " That is my stuff"?
In spoken form can I say " They are my stuff"?

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All good in my world.

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In spoken form, you really can say anything, lol.
But I think the grammatically correct way would be 'this is my stuff', since stuff is uncountable.

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Hi :)
The correct phrase would be "This is my stuff"
To use "These are..." or "They are..." you might want to consider the phrases "These are my things" and "They are my things"

Hope this helps!