In Out 

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

In-Out 

Slang; Nadsat for 'sex'

"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 

When Someone ejaculates in your ear, and it travels through your brain, and eventually exits the other one.

Dude, I totally had this chick In&Outed.

In&Out by Beastman October 6, 2004

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 

Vaginal or anal intercourse.

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 by Anthony Brancato April 21, 2003

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