Etymology
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spitball (n.)

1846 in the schoolboy sense, "bit of paper chewed and rounded as a missile;" 1904 in the baseball sense, from spit (n.1) + ball (n.1).

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Definitions of spitball

spitball (n.)
a projectile made by chewing a piece of paper and shaping it into a sphere;
spitball (n.)
an illegal pitch in which a foreign substance (spit or Vaseline) is applied to the ball by the pitcher before he throws it;
Synonyms: spitter
From wordnet.princeton.edu