When someone is so fat that their shirt or blouse won't touch their pants but instead hangs in front like a curtain in front of their pants.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

When your stomach is so fat it hangs over you groin