WTF is killing floor?

I'm hearing it over and over again in blues songs.

It's the strip club your mother works at

it's a game released by steam/valve. Like l4d.

It's the best gay bar in town.

>>3
Except for these songs are older than the first computer.

Killing Floor may refer to:

The area within a slaughterhouse or abattoir where an animal is killed

In music:

    * "Killing Floor" (Howlin' Wolf song), a song by Howlin' Wolf
    * Killing Floor (band), a British band that includes Lou Martin
    * Killing Floor, an album by Vigilantes of Love
    * "Killing Floor" (Bruce Dickinson song), a song by Bruce Dickinson from The Chemical Wedding
    * "Killin' Floor", a song by Body Count from Body Count
    * "Killing Floor", a song by the Australian band Redgum.
    * Killing Floor (band), a now defunct US ElectroPunk band.

In literature:

    * Killing Floor (novel), a novel by Lee Child
    * Killing Floor, a poetry collection by Ai

In other uses:

    * Killing Floor (mod), a mod for Unreal Tournament 2004
    * Killing Floor (2009 video game), a stand-alone game based on the mod.
    * The Killing Floor, a 2007 thriller film

>>6
Why not call it slaughterfloor?