smemorato di Collegno

Etymology
lit. 'forgetful person of Collegno'. From the Bruneri-Canella case, a notorious judicial and media affair about the alleged reappearance in 1926 of a man who had gone missing during World War I. Canella was an inmate at a mental hospital in Collegno, whence the term.

Noun

 * 1)  forgetful person