Having a strong enough majority to override any presidential veto.(adjective)
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Use "vetoproof" in a sentence
"They want us to convince Repubs to break with Bush and help us get a vetoproof majority."
"C'mon, do you think anything's going to work until we get enough scared shitless Repubs for a vetoproof majority vote next year?"
"Without a filibuster proof majority in the Senate, or a vetoproof majority in both houses what is your justification for giving Pelosi and Murtha a black eye on this bill?"