Running so hard that you throw up during or immediately after a race. Also can be used to describe the "puke" that is ejected from the person and onto another runner.
The act of adding a specific feature onto a theoretically finished contraption or building to stop Grian from tampering with it, which may result in said contraption/building being destroyed in a half a second.
To be used in the context of Minecraft
Grian-Proofing may also be used to classify some kind of lock on an object that stops it from being used by normal people that don't have the key.
Guy1: "OK, I think I've finished this massive redstone-only item filter."
Guy2: "Did you Grian-Proof it?"
Guy1: "Oh yeah... Would adding a misc. item bin be sufficient Grian-Proofing?"
Guy2: "Make sure he can't get the items back"
Guy1: >:3