What is Rock-paper-scissors?
1.
A game to decide any outcome.
see:
Lets chonk to see who gets to smoke the first bong.
See
2.
The only way to settle a dispute before resorting to violence.
Dude: "Shotgun!"
Buddy: "Challenge!"
Both: "One two three.."
Buddy: "Fuckin hell!"
Dude: "Hahaha, you're sittin'
bitch "