extramarital text 

Texting a member of the opposite sex, who is not one's spouse or partner, for the primary purpose of flirting.

Sue: That guy I bumped into at the bar just texted me three times to meet for a drink later. Bob keeps grabbing my phone to see who it is.
Mary: Well, you're hot, Girl! That won't be the first time you got caught having extramarital text.

extramarital text by redshirt58 August 22, 2011

extramarital text 

Flirtatious or seductive phone texting or email to a person other than one's significant other.

Dude, my baby's lost interest in me. She's on that phone all the time. I think she's having extramarital text.

Yeah, Bro, I just got a booty text from her!

extramarital text by weteachourselves August 14, 2011

textramarital affair

The art of cheating on your partner using text messages.

The neighbor girl and I are having a textramarital affair!

textramarital affair by Born Lucky May 27, 2010