textwalking
to walk as you are texting on a cellular device, unaware of what or who is around you.
I was textwalking Kevin on my way to class and bumped into a random dude in the hall.
textwalking
The process of returning a text message in a half asleep state of mind.
"Meagan texted me last night at like 3am. I think I returned it, must have been textwalking last night."