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slang A microwave oven. To "nuke" is a common slang expression meaning to heat something in a microwave. When I was in college, the extent of my cooking consisted of throwing something frozen into the nuker for a few minutes. I've got some leftovers if you want me to put them in the nuker for you.
n. a microwave oven. I tried to do a turkey in the nuker once and made a real mess of it.