FOMO

Noun

Fear of missing out.

1. An unreasonable and illogical state of mind that is nearly, completely overwhelmed by reckless emotion, mistakingly believing that if one does not participate in a particular event, one's life would be rendered much worse than the present.

2. First definition applied specifically to traders and investors of the stock market, having a fixed-false belief that a lack of participation in a given moment would completely ruin their day, maybe even their lives.

Trader Tom: Yo, man, it's 9:30 and $BMAC is tanking RIGHT NOW!! I gotta short this stock before it's too late!
Trader Joe: No, dude!! You got FOMO! Don't chase! Wait for a better set-up!

Trader Jane: I had a bad case of FOMO today. I got in $TURD and $DUMP at all the wrong places! I lost BIG TIME!
Trader Jack: That's rough, girl. Next time just wait for better entries!

High schooler #1: Man, I hate my parents! I'm grounded and they won't let me go to Darla's party!
High schooler #2: Don't get FOMO, you idiot! You already promised to play XBOX with me, you freak of nature! And Darla hates you anyway!