Sext

[Sonia]

To send suggestive text messages back and forth. Like cybersex, but with text.

[PussyCat]

To text someone dirty messages

[Donald Trump]

Text sex. Like phone sex but through text messages. (via Raunchy pictures and dirty talking)

[Mark Zuckerberg]

A cheesy hip portmanteau invented by the media during the mid-2000s to describe a new form sexual expression that had come about due to increased pressure and stifling of sexual freedom imposed by the hypocritical older generation (which they did not face during their younger years).
Used to increase legislation targeted mostly at imprisoning 18-25 year old males and create a moral panic among already overbearing parents, both of which are much easier to do when you can wrap it up in one catchy word that you think sounds like something the youngsters would say.

[Sonia]

Enjoying sexual pleasure from text messaging.

[Jason Yan]

1. Pornographic internet literature.
2. Dirty talk via instant messaging or e-mail.

[Raeanne Dimick]

A portmanteau word - (noun) a sexy text

[Sarah]

To flirt or have had cybersex with someone on the computer.
To flirt or have had cybersex with someone in a text message.

[Hina Muqadas]

Sexual satisfaction by dictation, smsing, tweeting, blogging, instant messaging, private Facebook threads, etc...

Sexual gratification by sharing written text.

[Couch Potatoe]

Sex over text often with *, -, or (s on either side of words.