Schrödinger’s sleeping child 

The mother does not know whether or not her child is playing DS under the covers or sleeping, and until she lifts the covers, the child will be in a state of simultaneously playing DS and being asleep.

There goes my son, ever Schrödinger’s sleeping child, can never tell if he's sleeping or playing on that damned game boy I bought him.

Schrödinger’s sleeping child by Doctor_Sex May 10, 2022

Sleeping Dictionary 

A "sleeping dictionary" is a term used to describe a person who gains a "new language (L2)" and culture by being in a romantic relationship with someone who doesn't speak your native language, L1.

See the movie "Sleeping Dictionary" 2001.

A young and naive Englishman, John Truscott , goes to the British colony of Sarawak, Borneo to try and apply his father's work to the Iban society. There he meets his boss Henry Bullard and his wife Aggie Bullard . John tries to civilize them, building schools and providing education for the Iban people. He is met with unfamiliar local customs. Selima becomes his "sleeping dictionary," who sleeps with him and teaches him the language and the habits of the locals.

Sleeping Dictionary by CatinTurkey April 29, 2013

Nichan sleeping bag 

When you stick both feet into a vagina and pull up until the vagina fully surrounds you in the shape of a sleeping bag

Bro #1: “I got so cold last night I went to my girlfriends house and used her as a nichan sleeping bag”
Bro #2: “same bro but I used my dog instead”

Nichan sleeping bag by Nichan December 10, 2019

Sheeping Bag 

A makeshift sleeping bag made from the coat of a sheep. Seen in Episode 4, Season 5 Man vs Wild.

"A sheeping bag is what is is."

Sheeping Bag by Maax Himself October 22, 2008

Sleeping On Me 

The act of not acknowledging someone's attractiveness. Whether physically, emotionally, or sexually.

1: bro this girl just isn't into it as much as I am. I would treat her like my queen.

2: damn bro her loss that's she missing out on this.

1: yea she's hella sleeping on me

Sleeping On Me by Tunces October 10, 2016

Steering Wheel Holder 

A person in control of a motor vehicle who is merely going through the motions of driving. Generally unaware of the situation around them, their mind likely not focused on operating the vehicle. Typical symptoms include driving slow in the left lane, tunnel vision, and being on their phone.

This idiot has been going 50 mph in the left lane for the past ten miles, he’s clearly just a steering wheel holder.

Steering Wheel Holder by Mikokat92 May 8, 2019

Steepling

When you touch tips and then, while continuing to touch tips, you also touch balls.

Pierre and Rick locked eyes as they touched tips, and grinned while moving towards steepling.

Steepling by Jimmy Jizzle July 27, 2019