Top Definition
(1) One who moves with great stealth in the shadows, and attacks without remorse.
(2) A Lurker assasin who makes little or no noise until it is too late.
(3) A cold-blooded killer that gets inside your head and kills you from within.
Before we knew what was going on, the Sneaky Night Muppet was upon us, inside our base, killing us off one by one.
by Websters June 15, 2004

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