más tonto que Abundio

Etymology
lit. 'dumber than Abundio', in reference to a person who supposedly lived in the 17th and 18th centuries in Cordova and tried to irrigate an entire farmhouse with his penis. Other legends about Abundio include his selling a product in order to buy another one of less value or worthless without the first one, e.g. his shoes to buy shoelaces or his car to buy gasoline. The veracity of the stories will never be known.

Adjective

 * 1) very idiotic