Posessing a large, juicy booty and other applicable curves.
Ooh, that Shakira is so rumptious. Did you see all that junk in her trunk?
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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
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."
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(rUMP-shus)
When someone's backside is nice
"OMG look at her butt!"
"Yeah it's soo rumptious!!"
"Right on!"
a Scrumptious Rump.
"Hey dude, that girl is Rumptious!"
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