The unsent response text after you ask a person a question that they don't want to answer. You have been texting back and forth for a while then you ask a question that the person wants to avoid i.e. Wanna hang out?, What are you doing tonight? We should go get a drink... Do you like me? The ghost text is only official if the person either responds to the next question you ask (ignoring the original) or if they text you back the next day acting like they never received it.
Me: Hey what's up
Girl: Nothing, u?
Me: Nothing much just got off of work
Girl: Cool, how was your day?
Me: Good, I just want to get wasted.... What are you doing tonight?
Girl: (no response) <---Ghost Text
Me: So did you have a good week.
Girl: Yea, it was long though...