gravitationally challenged vs tubby

gravitationally challenged

adj
  • Fat. 

  • Of a person, having a poor sense of balance; subject to intervals of dizziness. 

tubby

adj
  • stout, rotund 

  • Resembling a tub; sounding dull and without resonance or freedom of sound. 

noun
  • An overweight person. 

How often have the words gravitationally challenged and tubby occurred in a corpus of books? (source: Google Ngram Viewer )