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This means someone was screaming like a banshee during sex. The microwave is just a fancy way of saying they got wild.
My neighbor said I heard you using the microwave. I said, 'You heard me? I didn't even know you were listening!'
My mom called and said, 'I heard you using the microwave. I could hear you from the next town!'
My roommate texted me: 'You heard me using the microwave? I was doing my best impression of a howl from a wolf!'