FOMO (Fear of Missing Out) is the anxiety-driven emotional state that causes traders to buy into a rising token primarily because it is rising, rather than because of any fundamental analysis. FOMO buying is one of the primary drivers of parabolic price moves in meme coin markets: as a token rises, more potential buyers become anxious about missing the move, buy in, which causes further price rises, which induces more FOMO, in a reflexive loop until the momentum exhausts itself or a major seller emerges.
FOMO in the trenches
In fast-moving markets like pump.fun, FOMO operates on extremely compressed timescales. A token that has gone 5x in twenty minutes creates acute FOMO in traders who are watching it but haven't bought. The specific fear is "this could keep going to 50x and I watched it from the sidelines." This fear drives late entries that often occur near local price tops, making FOMO buying statistically disadvantaged — you're buying from the people who held through the early move and are now happy to sell to your anxiety.
Managing FOMO
Experienced traders treat FOMO as a signal to be cautious rather than acted upon. A position bought purely from FOMO, without an entry thesis, typically has no exit thesis either — the trader has no logical point at which to sell other than either further FOMO (keep holding because it might keep going) or panic (sell when it drops because there was never a reason to be in it).