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Stands for Brother/Sister moment, usually used in the title or description of a fan fiction. Closly related to DDM and usually is a fluffy moment where you are the brother/sister to a fictional character.
I read some really good Sam and Dean Winchester BSM on wattpad yesterday, it made me cry.
by ConfusedCat May 29, 2018
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A piece-of-shit school located in Brown Summit NC. Nobody likes it and the people who work there smell like they stuck their head up a fucktard's ass.
Man, BSMS stanks.........No really it smell s like a hairy muslim......
by the principal October 04, 2004
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Land of weirdos, mostly hockey territory is u dont rock with the hockey players you dont rock at all.
U go to BSM?

Yes but i rather be dead!
by Chicka What?!? April 22, 2005
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You know Katie, she is such a BSM. She kissed her prom dates best friend

Yo Jonny don’t be a BSM.
by lilnarco April 30, 2018
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When brandon brown (gay b17) gets aroused by his little sister miley. he also wants to shag her BSM stands for Brandon Shags Miley.
Yo BSM
by ImVeXzy(fuckofff) April 18, 2021
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