Bastardization of the Acronym F.U.P.A (for Fat Upper Pussy Area or Fat Upper Penis Area),
commonly seen packed into "mom jeans" like
sausage casing and on fat people in motorized scooters.
"My ex got
depressed and started eating four pints of hagen daas a day; now she's got a foopa that that hangs over her skivvies like wash
on the line." Or, in the menfolks' case: "His erection is
struggling to rise against his foopa."