To experience premature e-textulation is to accidentally send a text message or comment via phone or social network, before the text/comment is complete.
when your having "Hot" phone sex with your girlfriend/boyfriend by sending pictures or explicit sexual fantasies with each other and you cum before your partner does.
When you are texting someone and hit "send" accidentally before actually writing anything. Subsequently sending a blank text. Using this phase completely absolves your texting incompetence.
George: Hey Gina
Gina:
George: Uh, you sent a blank text.
Gina: Sorry George my phone has premature etextulation.
I just got a text from someone that ended in the middle of a sentence. He must have had a premature etextulation because he sent the end of the sentence in another text.