Garage à trois 

age à trois
1: an arrangement in which three people have a sexual relationship while in a garage.
2: a sexual encounter involving three people in a garage.

Megan told her two friends that wanted to have sex in her garage they could only do so if they added her " trois " and made it a garage à trois.

Garage à trois by TH3J4CK0FH34RT5 July 26, 2020

garage a trois 

n: a situation in which two people enjoy driving -- or worse, must share driving -- the same car.

girl: "I'm in love with my car."
guy: "Does your husband suspect anything?"
girl: "He loves driving it, too."
guy: "Garage a trois!"

garage a trois by stuku June 1, 2009