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A person - usually called Sam or Kathryn - who is (or is getting) a bit porky. Generally a temporary state between episodes of svelte fitness and tone.
1) Kathryn: *shows old photo of self* Sam: “Wow…!! Weren’t you a Fatty Puff Puff??!!?”

2) Kathryn: “Sam, you’re a sexy goddess, even if you are a Fatty Puff Puff "

3) Both: Are you sure you want full fat coke? Gotta watch the Fatty Puff Puff.

Then they eat sweets and talk about cavemen and horses.
by smallbutmighty February 01, 2017
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