The phrase oshi comes from Japanese fan culture for the idol or character you support above all others, and online it signals devoted, slightly obsessive fandom. Clips built around sobbing over an oshi spread as reaction audio on social media, where fans use exaggerated crying to describe moments that feel too cute, sad or overwhelming to process normally. The humor comes from that scale, treating a fictional favorite like a real emotional event. It remains popular as shorthand in anime and VTuber communities for a loving meltdown.