The term 'Ksos' is a French slang abbreviation of 'cas social,' which translates literally to 'social case.' Originally a clinical term used by social services, it was repurposed by urban youth culture to describe someone who is socially awkward, weird, or eccentric. In the meme landscape, 'Ksos' is used to label cringeworthy behavior or bizarre public outbursts. It gained massive traction on French-speaking social media as a quick way to point out people who don't follow social norms. Today, it is used both as a lighthearted insult among friends and a descriptor for the hilarious, inexplicable actions of strangers found in viral videos.