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1.
The illusion of appearing out of nowhere.

To Surprise, Spy, Sabotage, or Scare.
Batman.. Is a good example of a Herobrine.

Term originated from the Popular game of Minecraft.
by Kraftwurk February 23, 2013
 
2.
An NPC claimed to haunt minecraft.
Then and again, the awesome works of Notch and a few guys has uncovered this hoax.
Herobrine is just a retexture of the default character skin in minecraft (with white eyes.)
He's very creepy, and just runs away after staring at you.
Players claim to have seen him and after attempting to stalk him, they see his works of art.
Herobrine is obsessed with small pyramids in minecraft and 4x4 holes.
He was programmed to dig mini tunnels and make holes on walls.
Being a real scare to players in minecraft, some mod-makers decided to make herobrine mods that spawn herobrine.
Player1: OMG, I just saw Herobrine in my minecraft!
Player2: Lies, he's just a hoax created by Minecraft Devs to scare you.
Player1: STFU, it's true!
Player2: >.>
by WarriorX645 April 06, 2011
 
3.
A scapegoat used by minecraft players so that they don't get caught griefing.
For Example
Player 1: Did you take my diamonds?
Player 2:(who actually took the diamonds), No it was herobrine
Player 1: I know it was you.
Player 2: No it was Herobrine
 
4.
A common Minecraft-Related hoax that unatural objects can be generated in the game, such as reskinned/retextured natural blocks or "humanoid" Mobs (NPCs) that quickly dissappear when spotted. It is very similar to the real-life examples of Bigfoot spottings or evidence.
My friend claimed he saw a Herobrine, but it turned out to be two halfsteps on some clay." "The player was banned for constantly bugging others that he spotted a Herobrine Mob.
by Lavarat October 12, 2010
 
5.
A Minecraft character that is always watching you. 0-0
Guy 1: who is that guy watching us?
Guy 2: Dude, that's Herobrine
Guy 1: WTF!
by Hoc3000 August 09, 2012
 
6.
Stop.
Herobrine: Stop.
by Notch. July 07, 2011
 
7.
A human like mob (NPC to classify him right) was claimed to "haunt" the game Minecraft.

He used the default skin, but has pure white eyes. This was also claimed to be Notch's dead brother, who somehow got into the game...

Herobrine never attacked. He stood there off in the distance staring then disappear.

He made mineshafts, and houses and other things. This is probably why now, the game Minecraft has abandoned mineshafts and npc villages. (And maybe even dungeons!)

As a joke, Mojang (The company that made the game) puts in every update log - "Removed Herobrine"

But, he was never real. As seen from a tweet from notch himself saying that herobrine was never real, and it was a hoax. Yet still today, younger people who are first starting off (AKA noobs) and hear about this, still believe.

Here is a picture of Notch himself saying he was never real and that he doesn't have a dead brother.

gyazo.com/48c3d749f85ec36e3542f4f7a73a77ed

Or go to the wiki -

minecraftwiki.net/wiki/Herobrine
Guy 1: "Holy shit! I think i just saw the Herobrine!"
Guy 2: "He. Is. Not. Real. How many damn times to i have to tell you??"
by MCChick July 09, 2013