The story
From the radio show Fibber McGee and Molly, where the door to an overstuffed closet would be opened and the contents would spill out for many episodes from 1940 to 1959.
Etymology from Wiktionary, CC BY-SA 4.0.
Fibber McGee's closet
Today it means: A source of clutter, especially a messy area or room. Full definition →