Definitions by Brrrrap
xenu
The evil galactic overlord that stupid, stupid, gullible people known as "scientologists" believe to have wiped out billions of aliens on Earth 75 million years ago. Then Xenu collected their souls, known as 'Thetans', subjected them to brainwashing (how ironic) before releasing them back into the world, where they possessed our bodies and caused all of our problems.