Someone who texts a single person so much that it feels like the conversations never end. Sometimes the over-texting is so extreme that the over-textee starts ignoring the over-texter out of annoyance. These types of people are also often the ones who talk a lot.
Candice loves texting with Jeremy but she is a really bad over-texter because of it.
A person who tries too hard to be noticed in WhatsApp groups causing unimaginable harm to good people by writing more than zillion meaningless messages per second