HIMARS O'clock emerged as a viral phenomenon during the 2022 Russian invasion of Ukraine, coinciding with the arrival of U.S.-supplied High Mobility Artillery Rocket Systems. The term refers to the frequent night-time long-range strikes carried out by Ukrainian forces against high-value logistics hubs and ammunition depots. Visually, the meme often features a clock face where every hour is replaced by a HIMARS icon or a photograph of the system firing its distinctive rockets. It became a staple of 'NAFO' social media culture, used both to celebrate military precision and to exert psychological pressure by highlighting the inevitability of the strikes.