Also known as abdominal bulge, belly bulge, or stomach deformation. A sexual act in which the penetrating object is so large that it causes the abdomen to deform around it. Commonly caused by tentacles or a large penis. The level of detail visible through the skin varies.

Not to be confused with bloated belly, which describes a swollen abdomen caused by situations such as pregnancy or inflation by liquid or other substances and may not necessarily be sexual in nature.