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The back and forth movement of an erectile penis moving back and forth "in and out" of a girl's vagina; it usually is a repeated movement when it comes to sex and pleasure for the lady.
Its nothing special, they're just doing the old in out, in out.
In Out by Justin February 20, 2004
"I would have liked to have a bit of the in-out, in-out right there on the stage with her." - Alex (A Clockwork Orange)
In-Out by RandyL November 11, 2003

in/out calls 

a termed generally used by escort services in their ads. Meaning: the escort is able to go "out" to your home or hotel, or she offers her services "in" her home or hotel room she has for the time her services are offered.
Sizzling Blonde Babes. 36-24-36 Guaranteed pleasure. In/Out Calls Avail. 24 hours. 555-5555
in/out calls by adult sales rep June 22, 2006

in out hook 

When one person is in the for the other, the other person is out for the other, and they end up hooking. There are other combos in the matrix (in in hook, in in no hook, in out no hook, out out hook, out out no hook).
Tyler: "Did y'all hook"?
Ryan: "Yeah... it was an in out hook. She was in, I was out, but I was so ravenous, so I just went with it anyway."
in out hook by BrysonStrong November 3, 2021

in-out-in-out 

We went down to the derelict casino where we came across Billyboy and his four droogs (friends); they were getting ready to perform a bit of the old in-out-in-out on a weepy young devotchka (girl) they had there - from the 1971 film "A Clockwork Orange"

in-out in-out 

english slang term for sex, publicized in the movie clockwork orange
...so me and the other droogs were gettin ready for some of the 'ol in-out, in-out
in-out in-out by poosmack October 13, 2003
More from Urban Dictionary
anyone who succeeds in disgracing/over indulging themselves in the throws of clubland
28 hours and 4 clubs later, gurning for england but still refusing to go home - a total wrongun!!
wrongun by bevvers March 21, 2007
Word of the Day on October 8, 2026

square grouper

Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."
square grouper by slipsheet November 6, 2004
Word of the Day on October 7, 2026
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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