A body part that was not designed originally for the human body but appears widespread among middle age women, especially overweight women. It is a "hump" like shape similar to an ass, in size and in texture(except for smell) The frum was not designed for excretion and is purely cosmetic in nature. It has no actual use. A company designed the frum pouch and it is quite often seen on various frums.
"Hey, check out Sherry's huge Frum!"
"A frum? You mean her ass?"
"Not exactly dude. It's that ass that starts underneath her tits!"