horizontally challenged

Fat or obese. (Pseudo-politically correct slang used for humorous effect.) I became a little horizontally challenged after my accident, since I had to be in a wheelchair for nearly a year. Rachel used to be horizontally challenged, but now she's slimmed down considerably—I almost didn't recognize her. A: "I don't think that silhouette is the most flattering one for a, um, horizontally challenged gal like yourself." B: "Gee, thanks Mom."