In simple terms
A FOMO buy is an entry motivated by fear of being left out of a move that appears to be underway, instead of criteria prepared before the urgency arose.
The observable action
Compare the message or market timestamp with the planned trigger, executed price, size, and invalidation. Buying after a rally does not automatically prove FOMO: the same transaction may belong to a documented momentum strategy.
Check before the order
The FOMO concept covers the behavioral mechanism; FOMO in trading slang defines the noun. This verb-like expression concerns action attributed to urgency. Social sources, hype, and price speed do not replace instrument and risk checks.
Sources
- FINRA, Following the Crowd: Investing and Social Media — Warns that real-time sentiment and discussion can encourage impulsive decisions.
- Investor.gov, Thinking About Investing in the Latest Hot Stock? — Advises checking sources, objectives, and risk before acting on hype.