A character from the hit show Justified named after the phrase 'You only live once' who (spoiler alert) got killed by Patton Oswalt's character.
From Justified, season 4:
Picker: Who's that?
Raylan Givens: That's the man who killed Yoohoo.
Patton Oswlat: Yolo.
Raylan Givens: Whatever.
Picker: Who's that?
Raylan Givens: That's the man who killed Yoohoo.
Patton Oswlat: Yolo.
Raylan Givens: Whatever.
by Stavri January 22, 2014