Although it's unlikely to be officially added as a new word in the Oxford Online Dictionary (alongside recent additions "vajazzled" and "tweeps"), by the close of 2012, it's very likely that you will have come across an article or a tweet or a Facebook post that included the au courant colloquialism YOLO. What is YOLO, you might ask? For those of you without a Tumblr account or a teenaged child (with a Tumblr account, of course), YOLO is the cleverly crafted acronym for "you only live once." Think of it as "carpe diem!" for the text-messaging generation.