spitball >> ˈspɪtbɔːl
Definition: [noun] a piece of paper that has been chewed and shaped into a ball for use as a missile.
Definition: [noun] an unlawful pitch made with a ball moistened with saliva or sweat to make it move erratically.
Definition: [verb] throw out (a suggestion) for discussion.
Example: I'm just spitballing a few ideas