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.
When you type out a text, didn't proofread it, thought it said the right thing and hit send only to find out it's all jacked up and auto correct f***ed you. This is when you realize you just had a premature etextulation!