plumpy /ˈplʌmpi/adjective 1noun 1forms 3 adjective1 •Plump; fat; sleek."We're here t' greet ye," piped a plumpy little girl, pulling at Cal's sleeve. — 2010 noun1 •(informal) A fat person or thing.It was ladies' league night at the bowling alley, and when he stood in the bar looking out at the lanes he picked out her trim figure on lane 7 in a gaggle of plumpies. — 2007 formsplumpies · plumpier · plumpiest