Abbreviation for 'You only die once'.
A reminder for people who use the phrase "yolo" (you only live onve) as an excuse for stupid, dangerous and mostly pointless bullshit.
Guy 1: Let's beat up these douchebagsover there.
Guy 2: They're 15 we're 2 and they look much stronger. then we are!
Guy 1: Hey, we'll wing it, YOLO.
Guy 2: Yeah, right, tell that to your smashed cranium, dumbass. YODO!