ano de mayo Share definition Flag Antonym for obo de mayo. "Ano de mayo" is a term used to describe one who is very (de mayo) anorexicly skinny (ano). Curvy, well-endowed girls glare upon the cheerleaders and murmur to each other, "Ew, ano de mayo." ano de mayo by thehottone June 20, 2005 Get the ano de mayo mug.