Top Definition
Acronym for "Big Sister is Watching You." Inspired by George Orwell's book 1984, it's a useful word to remind little sisters that their big sisters are always looking out for them.
"my sister uploaded this totally inappropriate picture on to the internet, and I was like yo BSIWY and she took it down."
by g f b April 15, 2008
6 Words related to BSIWY

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