1 definition by The Wordsworth of the new age!

1
The description of a person (usually of the opposite sex) who has an overly exaggerated posterior or booty. A word discovered amongst friends and used widely in a smaller geographical area, this deserves a place amongst the Urban Dictionary.
Damn girl, you are bumptious!

Have you seen that new show with Kim Kardashian? She is Bumptious!
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