A fork of Rural Dictionary
The element of surprise! It rhymes with Sodium, but the explosion is even stronger than that.
Person 1: Did you get the Explodium?
Person 2: What's Explodium?
Person 1: The element of surprise!
Person 2: That explains why the room was charred with nothing inside.
Person 2: I guess it was surprising, though.
The unusual and rare material that all parts in Kerbal Space Program are made out of. Very unstable, and has a tendency to detonate on impact with the ground
A fin fell off my rocket in KSP and exploded into a large fireball when it hit the ground. It must have been made out of explodium.