The story
An Americanism, coined by singer Justin Timberlake in 2004 to describe the incident during Super Bowl XXXVIII in which singer Janet Jackson's right breast was bared.
Etymology from Wiktionary, CC BY-SA 4.0.
wardrobe malfunction
Today it means: An accidental counterpart of indecent exposure caused by a fault in someone's clothing (especially that of a performer) or by an error made while changing clothes. Full definition →