Big-Boned Meaning

(humorous or euphemistic) Fat, obese.

Example: Used other than as an idiom: Having large bones.
1904, Rudyard Kipling, They
  ...big-boned womenfolk strode away from their tea-tables to listen to the imperious Doctor.
1999, Nicole Hollander, My Cat's Not Fat, He's Just Big-Boned
2009, Harold Schechter, The Whole Death Catalog: A Lively Guide to the Bitter End
  Coffins for the Big-Boned. As the media never tires of telling us, America has become a junk-food nation with the fattest population on the planet.