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An executable computer program which is used to illegally bypass copy protection on games and commercial software by generating a random serial number, or "cd key", that matches the software it is intended to be used with. These programs range from very basic to quite complex, and are commonly distibuted along with warez. However, most games with online capabilities can now determine if you are using an invalid key and block you from playing over the Internet.
"I lost my CD case for Call of Duty, so I had to download a keygen to get a new serial."
keygen by Dogan September 13, 2005
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A random serial number generator, see also wordserial/word. Used in cases where a manufacturer of a program can ban certain serial numbers from working on its program.
I got a keygen for photoshop last night, it rocks.
keygen by Invalid H. User April 23, 2003
Keygen is abbreviation of CD Key Generator. It can generate serial of a commercial program like Photoshop. Try not to download keygens because they are powered by viruses to generate CD keys. Some keygens are fake, they are just a random number generator.
I searched the serial of Photoshop on Google because keygens contains Trojan viruses.
keygen by SandaimeSpaceMan February 16, 2008
KeyGen's are very helpful when you are close to being suicidal and just need a little more motivation.

It's like jumping off a building. Jumping off the building doesn't kill you. Landing on the ground kills you.

Don't attempt if you're not suicidal extremely deadly.
Cunt: I wanna die.

Faggot: Can you download a KeyGen for me?

Cunt dies.
KeyGen by BasicallyDead May 17, 2018

Sony Vegas Keygen

Upon pirating "Sony Vegas 8" you will almost always have this keygen by Digital Insanity.

With it's stereotypical hacker-montage music it will make you feel like a big hecker of the interweeb.
Computer: "Sony Vegas Downloaded"
King: Vegas 8... Sony Vegas Keygen...
*music starts*
King: EPIIIIIIIIII-

international Keygen Day 

An international Holiday annually celebrated on october 22nd for Spamton G Spamton.
"Did you hear? It's international keygen day tomorrow! Pipis is completely out of stock!"
A young boy with the most heart warming smile and dazzling blue eyes.

sometimes a handfull, still always a Wonderfull, beautiful, and handsome child.

Someone who has you wrapped up in a hug with a smile every time they see you, and at every good by.
Guy- I need some hugs and kisses! :(

Girl- yeah where is Keagen right now?
Keagen by Keagen May 24, 2014