when one of my chidren was off travelling the world we would chat on line. She would sign off with Love you miss you or similar and I would sign off LOL xxx. I meant lots of love and fortunately she realised that and put me straight.
in addition to this ROFL - rolls on floor laughing.....BTW - by the way.....BRB - be right back....lots of others along this line you can find out by hitting google and typing in "texting shortcuts".