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.
Billy: Did you see Mrs. Macky's fat curtain today.
Dan: Yeah it was like a cloth barrier for the wind that her fat rolls release.
When your stomach is so fat it hangs over you groin
The last time I saw my penis was in my teens due to my fat curtain