spitball

1. At the same time, a spitball hit the principal on his nose.
   就在这时，一个纸团飞过来打在了校长的鼻子上。

noun

1. an illegal pitch in which a foreign substance (spit or Vaseline) is applied to the ball by the pitcher before he throws it

   Synonym:    spitter

2. a projectile made by chewing a piece of paper and shaping it into a sphere