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What absolute cunts say. Why? To either excuse their wrongdoings or failishly attempt to seem cool. The statement itself is wrong, you live more than once, depending on the timescale you're looking at. For e.g. you live everyday. You only die once is not accurate either as some people die multiple times.
Slag: "YOLO!"
Person with intellect: "So by giving yourself a bad name and most likely a urinary tract infection you are living your life to its fullest?"
Slag: "YOLO?"
by SomeoneWhoIsntRetarded December 15, 2012
Acronym for: You Only Live Once
Person 1:"No. You can't do it, it's too risky!"

Person 2:"LOL! YOLO!!"
by p0tt3rh3@d August 21, 2012
You Obviously Look Obese.
Customer: "Can I order 2 double cheeseburgers, large fries, onion rings, milkshake, and a large Coke."

Cashier: YOLO
by SkinnyBetch August 11, 2012
A saying wich means "You only live once"
It's the motto. And it's usually said before a dumbass does some real dumbass, ignorant shit.
"I'm gonna go pee in a bush! YOLO!"
"I'm gonna smoke this leaf! YOLO!"
"I'm gonna jump off this cliff! YOLO!"
by Call me avalanche July 20, 2012
shut the fuck up
shut the fuck up
by satan6969r June 30, 2012
Basically means "carpe diem" for stupid people. It's an acronym for "you only live once."
Person 1: I yelled "YOLO" and ran out of class today.
Person 2: What are you, stupid?
by Roger Nadsworth June 13, 2012
an excuse to have sex with any guy you see
Girl 1: Should I hit up Dave for a booty call? I don't wanna seem like a slut.
Girl 2: Yolo.
by dude121212 June 11, 2012