adj. Having something to do with Xenu, a fantastic intergalactic badass who 1) according to Scientologists, was a naughty, naughty space-demon-thing about 75 quadrillion years ago, and 2) according to South Park, laughs like Jabba the Hut.
Real citation: "To prove his sincere Xenu-tastic passion for Katie Holmes, Cruise jumped on Oprah Winfrey's couch, yelling 'I'm in love!'"
("Tom: Crazy in Love," Dec. 29, 2005-Jan. 12, 2006, Rolling Stone, p. 97)
Made-up citation: "There's a fine line between Xena-tastic and Xenu-tastic. Actually, that's a lie. Xena would slice Xenu's nuts off and feed 'em to her cat."