Expression used by drag queens to describe the act of detaching/unwind their genitals that were hidden between their legs to give the illusion of a more feminine look. Often held in place with duct tape or tight underwear.
"While you untuck in the Interior Illusions lounge, the judges & I will deliberate." RuPaul
Last night I got home so late that I just ripped my jeans off and threw them onto the floor inside out. Now I need to untuckle my jeans before I can wear them again.