MBN is an acronym that stands for "must be nice". It can be used in several ways, such as to express envy towards someones relationship status or to show frustration towards someones situation that is seemingly better than yours. It can also be used as a passive-aggressive remark about celebrity culture or someone elses privilege on social media. The acronym is commonly used in texting and on social media platforms such as Snapchat, WhatsApp, Facebook, Twitter, Instagram, and TikTok.