Similar to "Fives" or calling "shotgun", "Quack Quack Seatback" is a common way to layshort-term claim to a seat you're about to vacate when with a larger group. Sometimes shortened to "Quacks."
Person A: "Hey, you stole my seat."
Person B: "It's my seat now."
Person C: "No, he called Quack Quack Seatback. Move it."
Raison de quack quack is inspired by the raison d'etre ... For ducks that would be, to be is to quack. For humans, to be is to ... quack like a duck? Or something else? (1) Being horny and (2) in the mood for a good time.
Queef really liked his women. He definitely had ze raison de quack quack.
"Do you have ze 'raison de quack quack'?", she asked, pulling down his zip.
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.