Derived from the word "shotgun" where the person who calls it gets the front seat in the car. Instead of using this only on driving in a car the word may be used to call "dibs" on something or doing something first. Also can be used as "shotty not" where it gives rights to a person not doing a specific task.
1. John called shotty on getting the last piece of pizza.
2. Shotty not taking out the trash.
