PewDiePie, the Swedish YouTuber Felix Kjellberg, built one of the largest gaming channels on YouTube in the 2010s with energetic Let's Play videos and direct, meme-heavy humour. YOLO, short for you only live once, became a widespread internet catchphrase in the early 2010s as shorthand for impulsive, carefree behaviour. Short voice clips of PewDiePie saying it began circulating on meme soundboards and in fan edits, where the phrase was reused far beyond its original video. It remains popular because the delivery is instantly recognisable and perfectly suits short-form clips about taking a risk.