The act of declaring your are an idiot before exercising poor judgement.
Going all in with a crappy poker hand on the internet with hundreds of people watching and saying, "85 off suit, on the button though. Sometimes you just gotta YOLO shit."
by Gary Daniels, TL Donovan January 07, 2015

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a modernised version of saying, "heyy dude! Watch me do something incredibly stupid" or "mum, I'm twelve if I want to smoke, drink and do drugs, you can't stop me".
Mum: "honey, this is an intervention, please sit down-"
Child: "mum whatever, no, yolo, like don't even."
by Urbanmaster101 January 05, 2015

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a stupid acronym wannabes and "cool" people use.It means "you only live once" which is obvious and stupid because everybody already knows "you only live once"(Its not like you're Jesus or something).
Timmy:YOLO!
random guy:shut the fuck up Timmy
other guy:No,actually Timmy's right *holds up gun and pulls trigger* YOLO Timmy!*BOOM!*
by 1-800retards united December 04, 2013

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A common acronym that teenagers use to stand for "You Only Live Once" usually used in the context of wanting to do something crazy, or fun (usually also stupid). It became popular in 2011 when a new rap song by Drake was released, it was titled "The Motto" it is in the chourus which goes like this

"Now she want a photo
You already know though
You only live once ‒ that’s the motto nigga YOLO
And we 'bout it every day, every day, every day
Like we sittin’ on the bench, nigga we don’t really play
Every day, every day, fuck what anybody say
Can’t see 'em 'cause the money in the way
Real nigga what's up?"
Teenager 1: Aye, you wanna go smoke some weed?
Teenager 2: Nah man i ain't 'bout dat life
Teenager 1: C'mon mah nigga, YOLO
Teenager 2: Nahhhhhh
by Mypseudonymisalreadybeingused November 15, 2013

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Stands for "You only live once". It's used as an excuse to be able to do bad things like drugs and kill people. It is super popular in California right now, kids in elementary school like to draw a giant "YOLO" on a piece of paper and put it on the front of their binder to use as a "cool" cover. It is considered to be not 100% bad, it also can mean that you only live once so try to make the most out of this life, and do GOOD things.
Dereck: Hey hottie you wanna smoke a cigarette?

Alice:No! I don't take these kind of offers from guys. I don't smoke, so don't pressure me like that.
Dave: Yolo. How about trying one?

Alice: I'm going to report you for peer pressure and harassment.
Dereck: Ya ok. Fine. But I really recommend cocaine and marijuana!
Alice: Leave me alone. Go away. You guys aren't very cool.
by SnowSakura October 10, 2013

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Y-you
O-only
L-live
O-once

O-only
L-losers
O-obey
Y-yolo
YOLO is an acronym said by annoying children because it was used in the rap song called "The Motto". It is used as an excuse for stupidity.
Tom: Sofia, why are you pregnant?

Sofia: LOLOLOLOLOLOL #Swag Yolo!
by Something_Of_Somethingness July 02, 2013

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"I love to take cock." or "I'm a faggot."
Yolo
by SPAWN May 06, 2013

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