When going down on an obese person, the lower abdomen sags down to cover the genitals. In order to reach the downstairs, you must lift the flap which is called a " Fupa". Once you lift the fupa, you stick your head underneath to go down and you are now wearing what is called " The fupa helmet" because the flap folds around your head like a helmet.
Dude, last night when I went down on Cindy, I totally wore the Fupa helmet.
by titsaflappin August 01, 2011