When you are touched by, enjoy or are perplexed by a text that you think about it for so long you forget to reply.
Joe: Hey Jill, did you get that text I sent you last week where I professed my love for you?
Jill: Yeah, that was sweet. Didn't Ialready reply?! Must have gotten textimental.
When you are attempting to multitask, have a conversation, send an email or a text at the same time and you forget what you are doing while you are doing it on your phone and you just keep opening and closing apps.