noun. A surgery that could be simple or precarious, depending on where the interstellar noggin hatched.
Real citation: "surgery went good...one completed alien-head-ectomy! Jme"
(Feb. 5, 2010, Jamie Elias, Twitter, http://twitter.com/jmeelias/statuses/8688030925)
Made-up citation: "As long as my annual alien-head-ectomy is covered by Obama's health plan, I'll be happy--and loyal to planet earth."