The phrase "that's on you" is used to say that the responsibility is yours, and yours alone.
This is a relatively new phrase, i.e. it didn't really exist 10 years ago. It is used when one person decides something by his/herself, or chooses an action by his/herself. When that occurs, the results, or the effects of the choice or decision are the responsibility of the person that made the choice or decision.
Examples:
A. I chose rock music as the theme of the dance.
B. Well, the dance isn't going well. That's on you.
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