"YOLO" is a song written and recorded by American comedy hip hop group The Lonely Island with American pop rock singer Adam Levine and hip hop recording artist Kendrick Lamar for The Lonely Island's third studio album The Wack Album. The song was released as the lead single from the album on January 25, 2013, worldwide outside North America. The single premiered in North America on Saturday Night Live on January 26, and released as a single the following day.

The title and lyrics of the song reference the popular motto and internet meme "YOLO" ("You Only Live Once"), a phrase dating back to the early 1900s and highly popularised by Drake and Rick Ross on such songs as "The Motto", which were intended to promote a mixtape originally titled YOLO. The phrase has since become a cultural phenomenon and has been reworked to be an excuse for irresponsible and outlandish behaviour, but most of the time it is used sarcastically in this manner.

"YOLO" parodies the phrase, and once again reworks the phrase to mean something else. The song's lyrics interpret "You Only Live Once" to mean the complete opposite of dangerous and irresponsible behavior, and to instead be over secure and protective of life, in a pessimistic viewpoint. The song urges the public to be fully aware of their surroundings and the hazards of everyday life, since everything, in the writer's viewpoint, is a threat to life. The lyrics also satirize basic knowledge of economical events, dangerous activities and life-threatening events, and make reference to famous or not-so-famous acts done by other famous people or citizens ("Then bury all your money in the backyard like a Beagle", "Build a bomb shelter basement with titanium walls"). The song further parodies the acronym of YOLO at the end from "You Only Live Once" to You Oughta Look Out.

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