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.
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!