noun. A positive thinker with cruel tendencies; someone who would remove your eyeballs with a spork, and a smile.
Real citation: "It seems that what the base is looking for in a President is a pro-life optimist with a sadistic streak--like, a sado-optimist, if you will."
(Jon Stewart, The Daily Show, May 7, 2007)
Made-up citation: "Sado-optimism, studies reveal, scores 110 kajillion points on the batshitometer."