YOLO - "You only live once" often shouted immediately precedingan untimely demisedoing something stupid
Cue an icon of 'face palm'.
But thank you for the explanation of the word itself, and for putting this horrid expression into its proper cultural context.
Right. Not a term I shall permit to pass my lips, and one which, if I ever do consider a dramatic return to the Groves of Academe, I shall immediately commit a verbally violent assault upon the person of any student foolish enough to let such a term slip within range of my hearing.