Here's how it could be interpreted:
* "Nero minded" as a metaphor for cruelty or recklessness: This assumes the speaker is drawing a parallel between the person being described and Nero's perceived cruelty. For example, "He treated his employees Nero-minded, completely disregarding their well-being."
* "Nero minded" as a metaphor for extravagance: This draws on the idea of Nero's infamous excesses. Someone described as "Nero minded" might be seen as excessively indulgent or extravagant. For example, "She threw a Nero-minded party, complete with gold-plated plates and a live orchestra."
* "Nero minded" as a sarcastic or ironic comment: This could be used to poke fun at someone's perceived lack of care or responsibility. For example, "He just sat there, Nero minded, while the whole place burned down."
It's important to note that this phrase is likely not a formal or widely recognized idiom. Its meaning is likely dependent on the context in which it's used.