When an elderly woman's wrinkly, shriveled up vagina is so dusty from vacancy, that when she becomes aroused from fingering her puss with her knitting tools she gets wound up. Then she queefs out a large queefy dust ball composed of gray pube hair and fluffy yarn.
Discloser: Warning this may be inappropiate for your grandchildren to read; they don't wanna read about your puss.
The "cat" doctor discovered a rather bulbous queef dust ball in nanas' cooter. He diagnosed her with queef dust balls syndrome.