That person that sends you a senseless message after having a text-message conversation that is over so that you reply and he/she gets to keep the "last" message and not reply again (especially done by women)
M: so, I'll pick you up tomorrow at 8 pm, ok?
W: Sure, I'll be looking forward to it. Oh, by the way, how did you do on that Genetics exam?
M: I think I did good, what about you?
...
W talking with a (female) friend: "You always have to be the last text keeper, that keeps him interested in you and knowing you are hard to get"
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