To add detail, because microwaves use (safe) radiation to cook, and nuclear weapons cause (bad) radiation, and "nuke" was already a slang term meaning to attack with a nuclear weapon, using "nuke" to refer to cooking something in a microwave became common. At least in the US. And apparently Canada as well, according to my source u/Nurgle_Marine_Sharts.
Also, many believed (including me as a child, and some still do I'm sure) that microwaves were dangerous, because they heard "radiation" and investigated no further.
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u/darklizard45 11h ago
Nuke it?