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Crudely or loudly assertive; pushy.

[Perhaps blend of bump and presumptuous.]

bump′tious·ly adv.
bump′tious·ness n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adv.1.bumptiously - in a bumptious manner; "he behaved rather bumptiously and offended the hostess"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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Naturally, Filipinos are sensitive about foreigners coming in and sometimes bumptiously pushing folks around.
On the eve of an important visit by United States President Barack Obama to the Gulf region last month, where he met with Arab Gulf leaders, the flagship magazine of the US foreign policy establishment, Foreign Affairs , published an article bumptiously titled 'The United States Has No Gulf Allies'.