1. To leave a social event without saying good bye.
2. To say you'll be right back or step outside and not come back to the party.
3. To hang out and after not too long of a duration, the person is no where to be found.
Brian's hanging out with his co-workers at the bar and says he's going to step outside to grab a smoke. After sometime, his co-workers realize he never came back.
Co-workers reaction - That fool freakin' ghosted us again.