LSTM

Textese is the abbreviated version of language used on mobile phones, Facebook and Twitter, where messages and status updates require some brevity because of the limit on the number of characters that can be used. This article from Newsweek offers greater detail and some words of warning about it seeping into education.

Generally, textese chatter amounts to shortened versions of linking words ('you're' becomes 'ur') but often acronyms are used to reduce complex actions and emotions down to a couple of letters. These can be as impenetrable as ancient languages, though it has to be said some of the acronyms have become familiar even to those of us who are still catching up, the likes of 'lol' or 'laugh out loud' and 'rofl' or 'roll on floor laughing'.

Interestingly, the school's own acronym, LSTM, also has alternative uses in textese. According to the Urban Dictionary, LSTM can mean either 'laughing sinisterly to myself' or 'laughing silently to myself' presumably for those occasions when you want to show you're feeling guilty about something but not too guilty or that something is funny, but not that funny. Useful.