killing floor

There's 3 definitions of a killing floor :

1) When you stab the floor or shoot it with a gun, you're killing it, hence the "Killing Floor"
2) You're walking, you're happy and all, then the floor kills you, maybe because of some traps hidden in the floor, hance the "Killing Floor"
3) A video game about zombies, there's a lot of blood on the floor and slaughtering corpses, so it's a "killing floor".

Now you know.

1)I was walking like every day and I tripped, so I made a killing floor.
2)Jigsaw wants to play with me, ha made a killing floor.
3)Rick Grimes is slaughtering a hundred of zombies, that's a real killing floor.