noun

the state of being fat; obesity.

her corpulence is the butt of every joke

obesity,fatness,plumpness,stoutness,chubbiness,chunkiness,paunchiness,portliness,roundness,rotundity,burliness,heaviness,fleshiness,meatiness,ample proportions,fat,weight,beer belly,paunch,tubbiness,pudginess,porkiness,beefiness,blubber,podginess,fubsiness,embonpoint