Top definition
A very well-toned, and shapely booty. Denotes certain deliciouness. Can refer to male or female.
"Did you see Becky leave the room? That, my friend, is a rumptious."
by Daniel & Mike February 15, 2008
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2
Posessing a large, juicy booty and other applicable curves.
Ooh, that Shakira is so rumptious. Did you see all that junk in her trunk?
by Cakehole August 16, 2005
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5
the act of ones ass getting big
I tried getting new pants but my ass was so rumptious that it didn't fit after a week
by vulupmtious boy 188 March 19, 2019
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