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2.
(a) Large and rotund body shape.
The man filling up his car at the petrol station was very rumpty.

The cartoon bear mascot was rumpty.
by Darrel and Richard Greaney January 24, 2004
 
1.
Old, ramshackle, badly built and a bit rustic.
The fence was so rumpty it fell down when she shut the gate.
by Lizly October 21, 2013