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A visible panty line (VPL) is the situation when the outline of a person's underwear is visible through the clothing. The underpants may be seen as a ridge or depression in the clothes, or as a result of the clothing material being sufficiently clingy or transparent.
Origin
The term "visible panty line" (VPL) likely originated from military barracks humor, serving as a satirical take on the excessive use of acronyms in bureaucratic language, drawing an analogy with the term "water line." According to The New Partridge Dictionary of Slang and Unconventional English, its popularization is attributed to its use in Woody Allen's 1977 comedy film, "Annie Hall."
References
Panty line Wikipedia(Text) CC BY-SA