Open fly
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An open fly refers to the unintentional leaving of one's fly unzipped or unbuttoned. It is often considered humorous if a person is caught with his or her fly down.
However, the situation is not always seen as embarrassing. Winston Churchill, while at a public function, was handed a note reading "your fly is unbuttoned." Churchill scrawled on the note returning it as "dead birds do not drop out of nests."[1]
[edit] Warnings
A number of euphemistic ways of alerting someone to an open fly are used. In English-speaking countries, often a subtle "your fly is open" or "your zipper is down" suffices. The abbreviation XYZ is also used to subtly remind the wearer to "eXamine Your Zipper." A longer variant is XYZPDQ ("eXamine Your Zipper, Pretty Darn Quick"). "You're flying low" is a commonly used warning in New Zealand, Australia, Canada and the UK.
In other countries, such as Myanmar, for example, different phrases indicating a cultural suitability have been created. "I see the market is also open on Sundays..." is a commonly used phrase in Myanmar and Vietnam.[citation needed]
In Lebanon, a phrase meaning, "Your market is open" is commonly used.
Another phrase used, "Are you afraid of heights? cause your fly is..."