noun
EXAMPLES FROM CORPUS
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Anna said they are the ones who score low grades and throw spitballs in class.
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I checked around for spitballs and paper wads.
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My memos are spitballs in the face of the faceless monolith where I work.
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The Operations students - the field men - are called spitballs around here.
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The other buildings are schoolrooms and a gymnasium for the spitballs and gut-men.