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5.
A term usually expressed when having sex with a "dog ugly" member of the opposite sex. Could also be used when slapping uglies with a PAT. “Lights out” is normally substituted for a lack of beer goggles.
Brian had to go "lights out" when he tagged PAT.
by Woody Johnson November 22, 2006
 
1.
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
 
2.
In sports, it means great performance.
"Maddux was lights out on the road, winning 8 of his last 9 decisions."
by erotica69 September 17, 2005
 
3.
To knock somebody out
*POW* Lights out mother fucker !
by ErikTheBeast February 23, 2006
 
4.

1. bedtime

2. time to die
Lights out little one. Its time to go to sleep.
by Light Joker February 10, 2007
 
6.
1) When a man ejaculates onto a person's face so their vision is blinded.

2) Choke a bitch
Shawne Merriman went lights out on Tila Tequila.

When I went lights out over this girl's face she couldn't find the handle to the bathroom.
by dodersesh September 07, 2009
 
7.
It is a time from the morning to the evening when street lights must be out because the sun shines all daytime.
"Lights out!", commanded early morning the chief of the town and a electrician switched the lights off there.
by wwvvw February 28, 2009