Gut Monkey 

A human fetus in the womb as seen from outside. The large swollen area of a woman who is far into a pregnancy. Especially a very large and pronounced belly shape. A humorous tone slightly related to the parasitic nature of a fetus upon it's mother.

It was quite apparent from the size of her huge gut monkey that she was easily 8 or 9 months into her pregnancy.

Gut Monkey by thechurchfodave September 20, 2011

Monkey Gut 

“The name for your stomach after you eat a huge meal that causes your gut to bulge out and stager around like a monkey.”

“Aaaaah, I got monkey gut so bad I’m afraid Jane Goodal gonna try to study me.”

Monkey Gut by Alibaster Slim August 6, 2012

gutmonkey 

Gutmonkey: that deep-seated desire/obsession/passion/addiction that, gut-level, inspires you to act.

From "gut" and "monkey on your back." Not a derogatory term, but rather one that invokes the passion of an addiction and the gut-level inspiration that moves people to action.

The word CafePress made up to describe the passion/obsession/desire that leads its users to create or buy specific merchandise that relates to their own gutmonkey.

Sam's more than just a foodie; trying new restaurants is a serious gutmonkey for her.

gutmonkey by buzzcowboy April 8, 2008