at near the same time. The person that receives the message first has to decide whether or not to finish the message or start a new one saying that that was the message they were in the middle of sending. Often abbreviated iwjitmostmty (I was just in the middle of sending that message to you) and, followed by a mutual lol.
When two people are text messaging or instant messaging each other with the same subject matter and the messages cross
I got your message earlier; I was actually midtext of sending you the same message, funny.