edit: refer to [this link](https://en.wikipedia.org/wiki/Negative_temperature) for further explanation
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Temperature isn’t defined how you think, it’s about a relationship between energy and entropy not just about energy. Irrelevant for daily life but results in negative temperature quirks being possible
Positive temperature means that as you add energy to a system entropy increases, electrons pick up more energy and are spread across more energy levels
Negative temperature means you add energy and entropy decreases
This is generally not possible unless you’ve done something to constrain what states electrons can hop into like with lasers in a lab. With the now limited number of states you can pump energy into the atoms until none of the electrons are in low energy levels so every bit of new energy concentrates them in the higher energy state which reduces entropy as there’s less variation
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