An old-fashioned 5.25-inch floppy disk, commonly used in early personal computers (such as Apple IIs and IBM PCs). So nicknamed because, unlike 3.5-inch floppies, they are flexible enough to bend when waved (that is, they flop around).
I should put a 5.25" drive in my old computer and see if there are any DOS games I want from the old floppy floppies.

Circa 1990:
Person A: "Can I borrow a floppy disk?"
Person B: "Hard floppy or floppy floppy?"
by Aaron of Minneapolis August 24, 2009

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