Top Definition
Adj.

Evil, ginger, and bitchy.
Man, that girl in physics class today was being extremely bumptious.
by ChemAddict March 25, 2011
Pronunciation buhmp-shuhs

adjective: offensively self-assertive: a bumptious young upstart.

adj. Crudely or loudly assertive; pushy.

Origin:
1795–1805; bump + (frac)tious
The bumptious six year old grabbed the toy from his little brother.
by martleo August 05, 2009
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