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.
When a guy confidently claims to know something, but in reality, he's just making wild stabs in the dark.
Often used to win arguments or to seem smart to impress the girls.
Tina: "Will we hit traffic on the way there?"
Bob: "No way, it'll be a smooth ride."
*Stuck in traffic for hours*
Tina: "Bob's guy guessing got us again!"
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.