Being ghosted by someone lukewarm is survivable. What mosting describes is being ghosted by someone who, three days earlier, told you they had never felt like this about anyone — and then vanished so completely that you're left holding a sentence you can no longer make sense of.

The name reads as a blend of doing the most with ghosting — though no source spells that derivation out — and it was coined in January 2018 by the journalist Tracy Moore, who argued that ghosting had become too broad a word. It covered the fade, the silence, the polite disappearance. It didn't cover the specific cruelty of a disappearance that had been carefully set up — the compliments, the future plans, the certainty offered early and freely.

That setup is the part worth understanding, because it's what makes mosting so disorienting to recover from. Ordinary rejection leaves you re-reading messages for signs you missed. Mosting leaves you re-reading messages full of the opposite — declarations, plans, promises — and trying to reconcile them with an empty inbox. The natural conclusion is that you did something to cause the reversal.

You almost certainly didn't. In the original framing, the flattery isn't sincere feeling that later faded; it's a performance, and the performance was the point. That's a genuinely useful thing to know, because it moves the question from what did I do to what was that for — and the answer to the second one was never going to be about you.