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A Keyblade is a Key shaped weapon, about the size of your average sword, that is used in the game series, Kingdom Hearts. Keyblades have mysterious properties in that only certain people can wield one. Keyblades also have the ability to change forms using different Keychains. A Keyblade can be used to unlock world keyholes in the game Kingdom Hearts and it can easily defeat strange enemies such as Heartless, Unversed, and Nobodies (Nobody). A Keyblade also collects hearts for Kingdom Hearts(Object).
"We need the Keyblade to collect Hearts. Kingdom Hearts will finally be completed!"

-Xemnas "Kingdom Hearts II"
Keyblade by KeybladeMasterXVIII August 18, 2010

Keyborderline 

Getting labile/depressed/wishy-washy while working on a computer.
He was not depressed he just had a keyborderline attack.
Man, you should have yourself checked for keyborderline
Keyborderline by Sammonator February 4, 2010
A Keyblade is essentially a giant key-like weapon. It can be used in many ways, like to seal the Keyholes of each world or to be used as a weapon. There are many people who wield Keyblades, but only Keyblade Masters, like Sora or the Unknowns from Kingdom Hearts 2, can use the Keyblades to their full potential.
"So, this thing is called a Keyblade..." -Riku
Keyblade by FinalHazard March 30, 2004
A large key-shaped weapon. It has the power to unlock any seal or lock (Assuming the wielder of the keyblade was a chosen keyblade wielder). It is said it can bring both peace and chaos. When the keychain attached to it's rear is replaced with another special keychain, the keyblade may change form into a new keyblade. (Still keeping it's unlocking capabilities)
"So the keyblade can unlock ANY seal?" -Hades
keyblade by UserXIII-SnowWind April 26, 2006

manic keyboarder 

That person who, when is quiet in a library or in a classroom, insists on striking every key they hit as hard as they can, because ya know that makes your typing more effective.
I was in the law library yesterday when this manic keyboarder loud typer hit one key so hard, I swore it was going to fly off her laptop.
manic keyboarder by sjkyr4 March 11, 2009
1. A weapon from Kingdom Hearts, which is a videogame series by square enix. The keyblade can change forms as you progress through the game, giving new abilities to the wielder. In Birth by sleep The keyblade was a large part of the the keyblade war, and it is the main weapon in KH apart from the struggle bat. It is said to be able to open ANY seal, but in game the only lock you open is the key to another world; locked doors stay locked.

2. A big Fucking key that can open any lock, except the one the to the bathroom.
Roflmao, Sephiroth got pwned with the winnie the pooh keyblade.
Keyblade by Seph Infinitum February 15, 2009