2000 — Joy Masoff, Oh, Yuck!: The Encyclopedia of Everything Nasty, Workman Publishing (2000), →ISBN, page 188:
Take a little food and stir in some GASTRIC JUICE, which is made fresh daily by the 35 million glands that line your tum-tum.
2006 — Jory F. Goodman, It Is All in Your Head: A Monograph on Wellness for the New Millennium, Synapse Publishing (2006), →ISBN, page 122:
Unfortunately anticholinergics do little to diminish other digestive functions, hydrocholoric acid excretion for example, nor do they dispose of that stuff you ate for the past 48 hours and lies inert in your tum-tum.
2008 — Hugh W. Rardin, It's Always Windy on Trash Night: And Other Facts of Life, iUniverse (2008), →ISBN, page 174:
Fundamentally you chose a 'seating' that requires you to — before the cruise even gets under way — carefully estimate the time that your tum-tum is most likely to want num nums.
2010 — Tracy Kelleher, Falling for the Teacher, Harlequin (2010), →ISBN, page 63:
"If you keep chewing on that nasty shoe, your tum-tum's going to get upset all over again," Wanda went on.
She fell down the steps, she sat in ice water baths, and she drank concoctions that almost killed her, but didn't seem to faze me. I kept growing in her tum-tum.
2011 — Joanne Kimes (with Leslie Young), Pregnancy Sucks: What to Do When Your Miracle Makes You Miserable, Adams Media (2011), →ISBN, page 172:
The Internet is full of sites where you can buy everything you need to make a plaster mold of your tum-tum.