Learn Polish: Właśnie o tym mówię! - That is exactly what I am talking about!

In Polish, when you use the preposition o to mean "about," the word that follows must be in the Locative case. Tym is the Locative form of the pronoun to (this/that). So, o tym literally translates as "about this."

I usually see właśnie translated as "just". Does it mean something different here?

Yes! While właśnie often means "just" (like "I just arrived"), it is also very commonly used to mean "exactly" or "precisely" when emphasizing a point. Here, właśnie o tym means "exactly about this."

Could I change the word order and say Właśnie mówię o tym?

You could, and it is grammatically correct, but Właśnie o tym mówię sounds much more natural as a set expression. Putting the verb at the end emphasizes the "about this" (o tym) part, which is the core focus of the sentence.

Why use mówię instead of another speaking verb like rozmawiam?

Mówię (from mówić) means "I am saying," "speaking," or "talking" in a general way, like expressing a thought. Rozmawiam means "I am conversing" or having a two-way discussion with someone. Since you are emphasizing the point you are making, mówię is the right choice.