in lay 

Presently and actively having sexual relations with another member of the human race.

Steve: Yo John, how's that new girlfriend of yours?
John: We're in lay...so that's good.

in lay by PlanetMaker October 1, 2011

lay-in 

A term used in prison referring to being given permission by one’s physician or psychologist to not have to leave the cell for a few days for whatever chosen reason.
.

I’ve only got the rent-a-phone for the next two days so I got myself a lay-in so I can get in touch with as many family members as possible from the comfort of my rack.

lay-in by Dr Bunnygirl October 19, 2019

lay in the cut 

To hang out in the background.

"Shit dogg! You lay in the cut straight sittin' in yo' ass and gettin' yo' drink on and yo' snack on, while we floss and fly this mofo all over this bitch." -Delta commercial

lay in the cut by Nick D February 24, 2004

National Do Nothing But Lay In Front Of The AC With Your Cats Day. 

American holiday on July 21. Declared on a scorching hot day in Rochester, NY.

Holy crap, it's 90 degrees in Rochester today. This is officially National Do Nothing But Lay In Front Of The AC With Your Cats Day.

National Do Nothing But Lay In Front Of The AC With Your Cats Day. by captainthesaurus July 22, 2011

Having a lay-in. 

It means, to lay in bed.
Not necessarily sleeping, enjoying peace and quiet alone.
Whilst the husband gets up, sorts out dotty
Changes Flo's nappy.
Makes Louie and Olivia's breakfast.
And makes Heidi a cup of tea in bed.
Whilst he's keeping noise to a minimum watching motd.

Where's Heidi?

She's having a lay-in.
She'll be there until one of the kids screams or the dog jumps up and licks her face.

Having a lay-in. by Dirky D. May 19, 2018

lay-in 

like having a lie in in the morning but instead of having a sleep, having sex.

Gavin "wow, you look exhausted"
Laura "yeah, I had a lay-in"

lay-in by sadgav June 15, 2011

lay in the cut 

Additional info: probably in reference to relaxing in a Cutlass Supreme automobile.

"Hey Putney, where you been?"

"Laying in the cut."

- Putney Swope

lay in the cut by Fog Hanson April 5, 2005