"Earthers" are people who believe that the 1969 US moon landing was staged and that our astronauts did not actually set foot on the moon. They believe it all took place on a sound stage somewhere. Earthers may or may not also be prone to spotting Elvis at 7-11, usually in rural communities.
Those who don't believe that Obama's birth certificate is real are known as "birthers." What about all those people who think the moon landing was staged? I believe they should be called "Earthers."