(baseball) A pitch of a baseball that has been partly covered with saliva, illegal at most levels. / A balled-up piece of paper, moistened with saliva (by chewing) and shot through a drinking straw.

(baseball) To moisten the ball with saliva before pitching it. / To brainstorm ideas.

plural of spitball

present participle of spitball

simple past tense and past participle of spitball

plural of spitballer

(baseball) A pitcher who moistens the ball with saliva before throwing it. / One who spitballs or informally discusses ideas.