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What is the viral SYFM trend on TikTok? Trending slang explained

Here's everything you need to know about the trending SYFM slang on TikTok.
posted by Shreya Ghosh
Friday 7/4/2025 at 6:15AM EDT
  • Tom Hardy in Bronson (Image via Everett Collection)
    Tom Hardy in Bronson (Image via Everett Collection)

    Slangs and acronyms have now become a prominent part of every conversation, especially virtual chats and interactions. Amid the surge of such words mostly used by Gen Z netizens, a new slang "SYFM" is getting popular on TikTok.

    Abbreviations are a simple way to describe an idea using the fewest words, or particularly just a few letters. Social media scrollers often come up with slangs to express their thoughts with ease. And presently, one such acronym that has been getting everyone's attention is SYFM. 

    For those unaware of the new term and its meaning, SYFM is short for

    "shut your f**king mouth."

    Read ahead to know more about the newest slang making rounds on TikTok.

    Everything we know about the SYFM trend on TikTok

    TikTok users might have come across the punchy term while scrolling through videos and reading comments. From post captions to comments to actual content, netizens are using the acronym to express what's on their mind in different ways on this video-sharing platform.

    According to a Dexerto report, the SYFM slang trend also includes a viral sound clip added with the abbreviation. The acronym was previously used in Bronson, a 2008 film starring Tom Hardy to portray the protagonist's role, Charles Bronson. Originating from the movie, the actor was seen bellowing SYFM out loud.

    Nearly two decades later, audio resurfaced as a meme around June 2025 on TikTok. The abrupt, exaggerated "Shut your f**king mouth" punchline adds a rib-tickling approach and a playful interruption to the videos, making them unexpectedly funny.

    Over the past few days, the creative inclusion of the viral slang has led to creators posting hilarious content on the platform. Most users are joining the bandwagon to make fun content and videos where they are usually adopting the slang and the sound to create lip-sync videos, intervene in someone's chit-chat, or make the other person stop.

    It appears TikTok creators are having fun playing around with the trending acronym and adding it left and right. They are joining the trend to make duet videos, reacting to others' content and. mocking them, comedy scenes, and more interesting and humorous concepts. 

    Now, the SYFM sound has transformed into more of a comedic, abrupt reaction audio, and not just another internet slang. It continues the meme tradition of playfully cutting people off while they are expressing themselves.

    To make the videos more dynamic, many TikTok users are also pairing the viral trend with sudden cuts, exaggerated reactions, and subtitles for maximizing comedic effect.

    An old video on the trend is resurfacing 

    According to a KYM report, as Distractify cited, the trending slang picked up steam and blew up online after TikTok user @morphelius.wetness posted a video on it years back in 2022. In these three years, millions of users have watched the video. However, it only started circulating on the platform recently.

    The original video by @morphelius.wetness features a kid describing his father. While talking on a stage, he calls out his dad for his old age. The little one said:

    "My dad is really old. He's the one with the naturally black hair, even though he's 50."

    Listening to his remarks, his dad reacted by shouting the popular phrase,

    "Shut your f**king mouth."

    To clarify it further, another creator edited the SYFM slang to the child's video. The person yelling SYFM was not his actual father.  

    TOPICS: SYFM, slang, TikTok