Top Definition
noun or verb

A prank played on someone related to the Slender Man mythos.

The act of playing a prank related to the Slender Man mythos
Bob: "Sarah just learned about Slender Man, let's pull a slenderprank on her to scare her"

Ted: "Hell yeah, I'm in. I love slenderpranking people."
by the real slim slendy October 06, 2010

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