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Sleep on 

To sleep on someone means you don’t believe they’ll actually achieve something they said they would or will do. It’s basically someone calling you bluff on something you say you’ll do, but instead of them verbally calling you bluff, they’re thinking it. Its thinking that someone will stay stagnant in a journey, process, career, etc. It’s a lack of respect towards that person either because they haven’t done it before or because you don’t believe in them. Basically, if someone is sleeping on you, you’re not a threat nor respected by that person and this is a time to prove that person wrong.
The other day, I told someone I wanted to be an oscar nominated actress. She laughed in my face and said “yeah alright sure thatll happen”. I laughed and told her “don’t sleep on me”.
Sleep on by Youngjoyswag March 9, 2018
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sleep on 

To ignore, overlook, or to forget something. Used as a verb, to sleep on something. Overlooking something that is deemed good or tight.
"Yall can sleep on the Steelers. They finna take it all this year."
sleep on by Thrilla in Vanilla November 24, 2004
Word of the Day on July 17, 2016

sleep on 

A imprint found on skin from your pajamas or underwear.
I woke up with a lot of sleep ons from the night before.
sleep on by JohnnyD_Urbanite January 20, 2017

sleep on it

delay the decision to the next day or something (idiom)
I'll get back to you tomorrow, I have to sleep on it
sleep on it by Rapture1 November 30, 2011

sleep on the floor 

Euphemism for performing coitus (having sex), not necessarily on the floor.
Jonathan: Hey did you sleep on the floor last night?
Mathias: Yeah! It was Sarah's.
Jonathan: LETS GOOOO!
sleep on the floor by rijoma March 1, 2021

sleep on mic 

to intentionally fall asleep with someone with your microphone left enabled on over a voice communication app, such as Discord.
Ashley: Josh, do you want to sleep on mic with me?
Josh: I thought you'd never ask.
sleep on mic by JKIM420 October 16, 2018

Sleep on me 

When you don't get the attention you deserve.
I really like Josie but she's sleep on me.
Sleep on me by GeeMoney100 October 2, 2016
More from Urban Dictionary
A girl who does ballet and only talks about ballet. Her schedule is filled with dance classes which does not allow her to do any other activity.
"Hey, do you know that girl Sally?"

"Yeah, she's kind of annoying. All she ever talks about it ballet."

"Wow, what a Bunhead."

"Hey Sally, you want to hang out this weekend?"
"I can't, I have dance."
"You're such a Bunhead."

"Yeah... I know."
Bunhead by Jen00 October 24, 2014
Word of the Day on October 6, 2026

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026
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