Light is on

When someone is ready to date or looking for a committed relationship.

"I think you should flirt with him, his light is on!"
"Men are like cabs. When they're ready to get married, they turn their light on." -- Sex in the City

Light is on by geistweg January 25, 2015

The light is on but nobody is home 

A common phrase used to refer to someone who's perception is very, very slow. An imbacil for example. Someone who just can't understand.

A: Excuse me, what time is it?
B: Time for you to go home and play with soap!
A: But my mom will be angry if I waste soap?!
B: The light is on but nobody is home
C: Kalevet!!!

The light is on but nobody is home by wandman September 1, 2005

Auxiliary light is on. 

Auxiliary light is on.

During the Russo-Ukrainian War the saying "Auxilliary light is on" came to mean: "you're all about to die." In 2022 drones purchased at toy stores killed or wounded groups of Russian soldiers after being armed using the auxiliary light button on the controller.

We're in position...grenade away. Lads, the auxiliary light is on.

Auxiliary light is on. by yhjuyjsx October 13, 2022

lights are on but nobody is home 

Used when describing a person who is not all there mentally, that is inept socially etc, or appears to be a bit thick. Struggles to fit into normal society, and subsequently rejected and described to people as a bit slow.
May also be used lightheartedly if someone is perhaps day-dreaming and not paying attention when asked a question. Similar to, but not quite the same"a few beers short of a six-pack", or "a few screws loose."

What if we asked Dudley if he knows?
What? You're kidding me right? Theres no way he'd know. In fact stay away from that bloke
Why's that?
You know, The lights are on but nobody is home.
Oh, ok thanks for the warning.

I can't remember, hang on a sec, i'll ask Harold.
Harold, whats the price of that Xbox again, you know the one you bought from E-bay?
Huh?
I said, how much was that X-box you got from E-bay the other day?
Oh? umm, ahh, hang on a sec
Sorry for the hold up Mavis, old harold here is in another world, the lights are on but nobody's at home, heheh.

lights are on but nobody is home by jamie_ledge July 19, 2006

lights are on but nobody is at home 

It means you are stupid.

She is not a very bright girl, the lights are on but nobody is at home.

lights are on but nobody is at home by dannetobbe October 21, 2015