Then take a wrapped straw, unwrap it, tear off a little piece of paper and make a 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.
To speculate; propose conclusions or possibilities: Well, I'm just spit-balling/ You're just spit-balling (1955+)
[second noun and verb senses fr the mischievous schoolboy's vice of throwing bits of paper soaked in saliva; verb sense fr the notion of tossing such spitballs more or less idly]