Question

what does it mean when someone says: \i have a theory about that\ in casual everyday language?
it means just the same as a scientific theory.
they are referring to the results of a carefully researched scientific question.
they mean they have a guess, hunch, or opinion.
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Explanation:

In casual everyday language, when someone says "I have a theory about that," they are not referring to a scientific theory (which is a well - tested and widely accepted explanation in science). It is not the result of a carefully researched scientific question. Instead, it is more like a guess, hunch, or opinion.

Answer:

They mean they have a guess, hunch, or opinion.