food baby

(idiomatic, humorous) A protruding belly resulting from the consumption of a large quantity of food; the contents of one's digestive system causing the protrusion.

Example: 2006, Sean Makiney, Belegana: Just a Silly Wite Man, Belegana, Ltd, page 153:
  I went to the restroom to give birth to a food baby...
2008, Diablo Cody & Jason Reitman, Juno: The Shooting Script, Newmarket Press, page 5:
  JUNO: (in low tones) Dude, I'm pregnant. LEAH: Maybe it's just a food baby. Did you have a big lunch?
2009, A. J. Walkley, Queer Greer, A. J. Walkley, page 233:
  "Becs, look, I ate so much I have a food baby," I said, pushing out my stomach for her entertainment.
2010, Jordan Pease, Don't Let Me Go: Based on A True Story, Trafford Publishing, page 140:
  If this hadn't been a dinner for me and I had been a little bit trashier, I totally would have undone my belt and button on my jeans, because my food baby was kicking.
2010, Virginia Maxwell, Alex Leviton & Leif Pettersen, Tuscany & Umbria, Lonely Planet, page 191:
  Dishes are largely composed of lighter fare - such as smoked swordfish and salmon salad - much appreciated when you're still carrying a food baby from a previous meal.