tummy /ˈtʌ.mi/ noun3 •(informal) The stomach or belly."So I broke away early this mornin', gave my guard a kick in the tummy that laid him out, and sprinted for the camp." — 1912 •(informal, slang) A protruding belly, paunch. •(informal, euphemistic) In reference to where a baby is carried, the abdomen, or specifically the womb, especially of a woman, but also of animals in general (usually mammals). formstummies