From a newsgroup post dated March 5, 2007:
I’m not sure whether it was my sister Jody or my mother who came up with that; it’s a spoonerism for “tummy grumbles,” of course, and means a digestive upset that’s inconvenient but doesn’t reach the level of vomiting or full-scale diarrhea.
When I started to think about posting this I was quite sure it was Jody’s word, but the more I think about it, the more I think it was Mother’s. I don’t suppose it matters, since they’re both long dead.
It came to mind… well, yesterday I finished off a package of bacon that had been in the refrigerator for awhile. I think from now on I’ll make it a rule: If bacon smells funny, don’t cook and eat it.