Similar to "Fives" or calling "shotgun", "Quack Quack Seatback" is a common way to lay short-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."
When leaving a chair, you can say "I call seatback" and no one else in the room can take the seat away from you. Similar to saying, "I call shotgun" when approaching a car.
when leaving a seat calling seatbacks before someone else sits in it gets you your seat back upon returning. If you sit somewhere else, or go outside than seatbacks is nullified.
Get up out my seat, I called seatbacks 'fo you sat down
A generally large, overweight, or obese person usually compared to a whale that has been harpooned by a ship and got away. Basically entailing that the person is as big as a whale, and has scars on their back just like a once harpooned whale.
There are many different breeds that include:
Bearded scarback
Albino scarback
etc...
Holy shit Marv! Did you see the size of that scarback!
That scarback had the largest fupa i have ever seen!