Literally: a cold hurricane.
Some people misuse the term to mean "a blizzard affecting New England and/or the Northeast", but it actually specifically refers to a storm that's been pushed inland by sea winds coming from the northeast, off the Atlantic Ocean. That specific pattern results in a particularly cold and brutal storm.
Nor'easters are technically cyclones, just like hurricanes, and the two are very similar in many regards. The difference is that a Nor'easter forms further north, in cold water, and it is actually strengthened by cold air, whereas hurricanes form further south and are diminished in strength as they cool off.
…but they’ll be fine with a ‘a big cold cyclone’ I guess ;)
Well, it's literally true: a hurricane is a tropical cyclone, and a nor'easter is an extratropical cyclone. A nor'easter is literally the "cold" counterpart of a hurricane!
That's not nothing.