When one party in a text-message conversation chooses to reply with extremely short, vague sentences in order to try and kill the conversation and end communication with the opposing texter.
The act of forgetting the last text you sent to someone, making their response seem completely random.
Julie: I can't believe he would do something like that!
Courtney: I know! It was totally rude.
Julie: Sorry, what was rude, I totally have short-term texting.
This is when someone uses caps lock on all or some of their words when sending a text or message. The term is interchangeable - "text shouting" "shout texting"