He's this guy in a horror video game who follows you while you walk through a forest, when every time you turn around, he gets closer, and closer to the point where he can kill you. The words of my videogame-loving friend. :)
Slenderman is a very old tale of a rather large human figure (around 7 to 10 foot tall) that would be seen around or near children. These children then would often disappear or be reported missing, he was often seen to be wearing a kind of suit without having any facial expenditures to figure (blank white face), there are hundreds of pictures of apart sightings but no hard evidence has ever been found, also no cases of missing children have been reported lately and it seems to only be stories from a long time ago, more then likely to scare children.
It's a popular game on the internet and is a free to play game. It's a first person game and you have to find 8 pages in the woods but after a while a tall black figure with a white head will stalk you everytime you look back and or keep on finding more pages.
hes sopposivly a tall man in a suit with no face at all he was cheated on by his wife with 8 men he was so mad he cut off his face and killed everyone who entered the woods by his hide-out in nevada: he was just a myth to scare kids from going in the woods