An affair between two people that involves constant text messages on daily basis. This type of affair dose not involve sex between the two people. It may hover include talk or images of a sexual nature.

When you eat dirt for the first time and leave your family to build a shack in the woods

text messages between two people who are constantly texting between each other. Although there is not physical relationship. The conversations do include talk and images of a sexual nature

Having an affair via text message with another person.

I invented this phrase back in late 80's when mobiles 1st came out n my ex was having a textaffair with some girl.