spitball

But the very first "spitball" which spattered upon the blackboard proved a disastrous missile for its thrower.

I thought I could go through the motion of throwing a spitball without letting it go.

Hooper was a spitball artist, and his moist slants kept the Giants guessing in the early part of the game.

He had never cared for the spitball, as he knew that sooner or later it destroyed a pitchers effectiveness.

There are also other modifications called "the fade away," "the spitball," and others.