To inhale on a Juul (a type of e-cigarette) until the light on the front goes out. Perhaps the hardest challenge of 2017.
"Light out, dude!"
"Nah I can't man, I'm finna get emphysema."
by BatwomanLovesDucks December 9, 2017
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In sports, it means great performance.
"Maddux was lights out on the road, winning 8 of his last 9 decisions."
by erotica69 September 18, 2005
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When two balls are shot into the last remaining cup in a game of beer-pong, eliminating the chance of an opponent rebuttal
G1 "why didn't you take your rebuttal shots?"

G2 "Conner and Ipp just went lights out on us."

G1 " HaHa...you guys got fucked"
by buckkkkk April 23, 2009
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Did you hear about the dude that dropped dead while running a marathon? His heart fucking exploded and it was lights out right in the middle of the course! People had to run around the body for over 10 minutes until they tarped the corpse.
by Wordmaster Adam December 23, 2016
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line from smells like teen spirit and nirvana box set I own
with the lights out it's less dangerous,here we are now entertain us!
by futuramafan March 17, 2008
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