If you describe someone as dumpy, you mean they are short and fat, and are usually implying they are unattractive.
英汉词典释义
adj.
(尤指人)矮胖的
a rather dumpy, unprepossessing servant相当矮胖，不讨人喜欢的仆人
英英词典释义
Adjective
1. short and thick; as e.g. having short legs and heavy musculature;
"some people seem born to be square and chunky""a dumpy little dumpling of a woman""dachshunds are long lowset dogs with drooping ears""a little church with a squat tower""a squatty red smokestack""a stumpy ungainly figure"