spitball
noun
1. a projectile made by chewing a piece of paper and shaping it into a sphere
Definition categories: man–made, missile, projectile
2. an illegal pitch in which a foreign substance (spit or Vaseline) is applied to the ball by the pitcher before he throws it
Similar word(s): spitter
verb
1. (baseball) To moisten the ball with saliva before pitching it.
2. To brainstorm ideas.