Lorenzo von Matterhorn is a fictional character within a fiction. In the TV show "Hor I Met Your Mother" one of the characters is back on the dating scene. And to succeed in this endeavour he creates a character, Lorenzo von Matterhorn.
This fake character is backed up by a series of fake web pages, describing Lorenzo von Matterhorn as Swiss, a billionaire, an animal lover and someone advised not to have penis reduction therapy.
When he casually drops this name to a girl she is intrigued enough to Google him, sees all of this and then when asked for a date obviously says yes.