A fork of Rural Dictionary
An object that is apparently indestructible. Often used in reference to anything that has been overbuilt or had additional material welded to it.
A horse that is very well trained and calm, that isn't easily spooked. Term originated for Military horses who must be "bomb-proof" so they don't spook at the sound of a bomb/gun/etc. Children's riding ponies often must be bomb-proof because kids tend to run and jump and make loud noises--all things that might scare an ordinary horse and cause him to hurt somebody.
My old mare Goldie was a bomb-proof horse-- We could drive the tractor right past her and she wouldn't even flinch!
To be be immune to almost every possible jumpscare where one would barely flinch, if at all.
I nearly crapped myself playing that game, yet here you are breezing through it. You're so bomb-proof!