Used whenever someone says something pretentious or just 'full-of-shit-esque."
Used because people who drink the aforementioned beverage think they are better than regular people who drink latte's with 'milk' in it (hence the reason why it is called a latte).
Girl B: "Wow, how soy latte of that motherfucker"
Guy A: "You know what, I never thought of it that way. And guess what....She DOES like soy lattes."