In text or online messaging, HMS commonly stands for:

• Hours, Minutes, Seconds - often used when referring to time durations or timestamps.
• Her Majesty's Ship - a prefix for ships in the British Royal Navy.
• Hold My Shot - less common, sometimes used in gaming or casual chat.

The most frequent meaning in casual texting is Hours, Minutes, Seconds , especially when discussing time or countdowns. If you have a specific context where you saw "HMS," I can help clarify further!