It means Best Friends Sister. Commonly used when one is in love with best friend sister.
"Bro I like your sister."
"So you're in love with your BFS?!?"
"Yes, yes I am."
by DoubleB. May 2, 2021
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There are three logical meanings

1. Bowling For Soup (one of the best bands ever, they sing 1985).

2. Bull-fucking-shit
3. Boyfriends, since bf is boyfriend (apparently)
"Hey did you see that new Bfs video?"
"What there's a new one!?"

"I mean I'd never do that!"
"Bfs, dude."

"I was txtng my bfs n accdntly mixd there namez!"
by Fameandspam September 4, 2014
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Big fat session , big fat sesh
Come on feins let's go have a bfs
by ajaymc January 26, 2016
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brookelyn suffers from bfs
by Md197505 February 14, 2022
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Bearded Fuck Stick (noun) a man, typically a man who works for the city, who has a beard to rival Gandalf and is dirtier than a sewer rat.
scott: was that a yeti?

Bill: No, That's just a BFS.
by felipefesfeas May 1, 2019
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