When an area is bombed to a degree that nothing remains.
Based off of the idea that when a nuke goes off in the desert, the sand turns into a glowing sheet of irradiated glass.
Ally: So, what did you dowith that guy last night?
Gertrude: Just spooned him and stuff... ;)
Ally: No forking or wine glassing involved?
Gertrude: GOSH NO.