Preemptive Text 

n. A text sent to a friend whom you are about to visit, alerting them prior to your arrival.

Phil - "Hey guys, we're about to go to Joe's house."
Zeek - "Does Joe know this, or are we just going to show up?"
Phil - "Yeah he knows. I sent him a preemptive text."

Jason - "Wanna' go to Steve's?"
Ralph - "Sure, but let him know or he won't answer the door."
Jason - "One preemptive text, coming up!"

Preemptive Text by Stickboy142 August 16, 2011

Preemptive Text 

A text message that is sent to someone under the assumption that you know that they're going to text you. Commonly used with tech-deficient family members who take forever to answer text messages.

I sent a Preemptive Text to my mother to inform her that i was driving home, because I knew she was gonna ask where i was.

Preemptive Text by Musculoso March 1, 2010