adj. 1. of extremely enlarged nature.
2. filled to the maximum amount.
1. "Those water balloons are to small! Fill them to a plumptuous amount, you moron!"

2. "Wow, her blouse is filled plumptuously."
by the winterfresh January 18, 2008
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the thiccest, juiciest, absolute FATTEST ass to be known by man kind. Typically owned by kids who’s name starts with a B and ends with an N.
yo homie I hit that plumptuous thang last night and it was pretty steamy😏
by chicken1010101lover October 18, 2020
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A combination of Plump and Voluptuous. A sexy, beautiful and thick woman.
My friend said that girl was too big, I said bruh she is “plumptuous”. She is perfect!
by September 9, 2023
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