YOLO is often used as a hashtag on Twitter to bring attention to exciting events or excuse irresponsible behaviors. The acronym was popularized in 2011 after being featured in the hip hop single "The Motto" by Drake. In November 2012, the Oxford American Dictionaries included the slang term "YOLO" in its shortlist for the 2012 English Word of the Year.
The earliest known use of the acronym is attributed to Adam Mesh from the third season of the NBC reality show The Average Joe. Mesh launched the "You Only Live Once" (YOLO) clothing line on March 20th, 2004.