1. To completely microwave something beyond recognition.
2. To completely destroy with nuclear weapons.
1.
Person 1: "Dude I got to run the store for some food. I forgot to change the power level on the microwave, so I totally just glassed over my Bagel Bites."
Person 2: "Man only idiots glass over Bagel Bites!"
2. "Screw invading Canada. Let's just glass them over with nukes instead."