“I will die on this hill” is the original phrase here, meaning that you will defend this viewpoint to the last. A related and possibly alternate origin is calling an opinion or viewpoint someone’s “hill to die on”.
The variation you’ve brought up is a humorous/sarcastic way of saying that someone has made an odd choice of opinion or viewpoint to defend so vigorously.
For example, being a militant supporter of putting toilet paper on one way or another would be a weird hill to die on.
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