(n.) Nickname of the seed pods produced by sugar maple (Acer saccharum) trees (Liquidambar styraciflua, according to other sources). When ripe, these hard, spiky green balls are about the size of ping pong balls, and make excellent, abundant projectile ammo.
"Okay- everybody grab your sling shots and rackets, and pile upthe monkey balls! THE WAR IS ON!!!"
A game developed by Amusement Vision, a subsidiary of Sega, and released as a launch title in 2001 for the Nintendo GameCube where the player is tasked with getting a monkey trapped inside a ball into the goal. However, moving the Control Stick doesn't move the monkey, rather, it tilts the stage. This game is actually a remake of a Japan-only arcade game, simply titled Monkey Ball.