Hi and welcome!  I don't know your age, and not supposed to ask, but if you happen to be middle ageish, then here are some more to help you.  Enjoy!
MIDDLE AGE TEXTING CODES:
ATD -at the doctor.
BFF - best friend fell. 
BTW -bring the wheelchair.
BYOT -bring your own teeth. 
FWIW -forgot where I was 
GGPBL -gotta go, pacemaker battery low. 
GHA -got heartburn again. 
IMHAO -is my hearing aid on?
LMDO -laughing my dentures out 
OMMR -on my massage recliner 
ROFLACGU -rolling on floor laughing and can't get up.
TTYL -talk to you louder! 

