What Does 'BSF' Actually Mean on Social Media?

Another day, another acronym we don't recognize. From TikTok to Snapchat to Instagram, internet-speak or Gen Z slang is pretty much everywhere. Sometimes, the terms are more familiar, like TMI or TTYL. But other terms—like OOMF and TFW—leave some of us confused. That's why we're here to fill you in on BSF's meaning.

"BSF" is likely a term you've seen while scrolling through various social media platforms. While it might look new to you, it has shared significance with another popular acronym—one that we're all definitely familiar with. Find out how to use "BSF" online and what well-known term it's actually replacing.

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What Does 'BSF' Mean on Social Media?

In slang, "BSF" means "best friend." Another definition, although much less common, would be "best sister friend"—AKA a friend close enough to be a sister.

As one user explains on Urban Dictionary, a BSF is "a best friend who is like a sibling to you or just a best friend."

According to National World, "There is also one possible meaning that is unique to Roblox. That is ‘But Seriously Folks’. It’s not used often, but when it is used in the chat function or spoken by a player in a game, it means that a person is indicating that they want to go back to talking about the original topic of conversation."

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When Did BFF Become BSF?

Instead of calling someone their "BFF," as older generations have, the younger crowd has opted to use "BSF." Net Influencer explains: "In the late-2010s, teenagers popularized the term ‘BSF’ across social media platforms."

Now, with platforms like TikTok, people have been using the term with even more regularity. After all, #bsf has over 8.1 billion views on the app.

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Examples of How To Use the Term 'BSF'

Curious about how to use "BSF" in comments, captions, hashtags and more? Here are some examples.

  • I don't know what I'd do without you #bsf

  • HAPPY BIRTHDAY TO MY BSF—I LOVE YOU

  • Going out with my bsfs tonight

  • I'm a little jealous of his BSF

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