Be cat. In addition to what furoya and other Hispanic colleagues, here, in the madriles, it means to be blooded Madrid; at least of 3 or 4 generations. It seems that you are called so from the time in which the Arab fortress of Magrit was conquered beyond by the 11th century by Castilian soldiers of Alfonso VI. A soldier climbed the wall of the cuesta de la Vega, of more than three meters, to change the Muslim flag by the Christian, with the skill of a cat. We have current witnesses of this wall in the area of the Royal Palace, calle Bailén, main street and the viaduct over the calle Segovia and other places in the neighborhood of la Latina. In this area, at the slope of the Vega, which ran a stream towards the Manzanares River, also there were the shootings of May 3, 1808 ( 41 Goya; and not in the mountain from Príncipe Pío, according to latest research.