Having sagging folds of flesh beneath the chin or lower jaw(adjective)
WordNet. Princeton University. 2010.
Use "double-chinned" in a sentence
"He was a big, beefy, red-faced personage, full-jowled and double-chinned, sweating at his desk in his shirt-sleeves."
"She adds a feminine touch to the preponderance of slack-jawed, double-chinned shock jocks of the world, leavening their testosterone with her estrogen."
"The all-rounder evokes memories of a time when England's cricketers were sulky and double-chinned"