when you see a girl from the side, and her fat stomach sticks out farther than her titties do

This is when a woman's belly sticks out farther than her titties do

When a girls belly hangs out more than her titty do.

Referring to an obese girls gut, and how far it protrudes from her body. When viewing her from a profile you can tell that her gut sticks out farther from her body than her titties do. Hence titty do.

This is when you can't find some hoe's gap because the hoes belly hangs out farther than the hoes titty's do.

On a female, when her belly or fupa sticks out further than her titties do..