one in one out

when you stick one ball into a vag then the other one is being sucked by a differnt girl.

hell ya i put my ball on her face i called it one in one out!

by awsome6000and3 April 1, 2010

one in one out diet

A diet based on making a bowel movement shortly after eating a meal to excrete the prior. Thus keeping a person at a consistent weight.

Person 1: Yo' Flossy.
Person 2: Sup?
Person 1: Hey man how do you stay so thin.
Person 2: The one in one out diet, I be shittin' all the time!

by Flossy May 31, 2005

One in, one out policy

The sudden need to pass a bowel movement right after eating a meal.

Steve - "The doormen of my guts hold a one in, one out policy"
Jane - "Why are you calling me to say this?"
Steve - "Could you ask the waiter to bring more paper to the lavatory, they're all out."

by IanContinentia October 19, 2009