A person who texts so much to people sitting next to them, they forget how to speak and lose vocalability.
Jill says ,"Hey Carol, what are you doing?"
Carol Looks up at Jill and nodds, but says nothing, but she keeps texting.
Suddenly, Jill gets a text message -I'm texting-\
Jill becomes angry with Carol.
"WTF? I'm sitting right here just talk to me!"
Jill gets another text message -Sorry?-
Suddenly Jill gets it.
"Oh, I forgot you were a Text-Mute."