The Man Behind the Slaughter refers to a series of ironic memes referencing a line from a fan-made Five Night's at Freddy's song "It's Been So Long" by The Living Tombstone. The line "the man behind the slaughter" describes the main antagonist of the series William Afton (aka The Purple Guy), with memes referencing the character in one way or another, often by including the line in the caption.
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