Went Ghost
Disappeared
Example
Felipe went ghost last Friday and has yet to respond to any of my messages
He's probably hiking and doesn't have cell reception
Possibly.  I just hope he's OK
 
Related Slang
| Ghosting | Leaving without saying goodbye | 
| Irish goodbye | Leaving without saying goodbye | 
| Dutch leave | Leaving without saying goodbye | 
| French exit | Leaving without saying goodbye | 
| Bounce | To leave | 
| Jet | Leave quickly | 
| Dip | To leave | 
| Rollout | To leave | 
| BBN | Bye-bye now | 
| Bye Felicia | Goodbye | 
| Benching | Using a person as a backup date | 
| Haunting | Following a romantic partner on social media after abruptly leaving them | 
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When a person went ghost, they disappeared without a trace. They may have left a social gathering, relationship, etc., without a proper goodbye and seemingly disappeared.
Typically, people who ghost are people who don't want to go through the drawn-out process of saying farewells. Ghosting looks differently depending on the circumstance.
For example, if a person is at a party and bounces without saying goodbye, he went ghost. Or, if a gf in a relationship is stressing out about how to end it and cuts off contact without a proper break-up, she went ghost.