The term 'recoil gun' refers to a type of firearm that uses the recoil of the gun to eject the spent cartridge and reload the chamber with a new round. The term 'KICK' is a four-letter word that is often used to describe the sensation of the recoil of a gun when it is fired. This sensation is caused by the force of the bullet being propelled out of the barrel, which causes the gun to move backwards in the shooter's hands.