Welcome to the board from Southern California!
There are so many abbreviations that are used!! I think there was a thread at one time that explained a lot of them.
DH, DD, DS, DGD/S = dear or darling husband, daughter, son, grandson/daughter etc.
LOL laugh out loud
RFLOL rolling on floor laughing out loud
WOF Width of fabric
FQ Fat quarters
LMAO Laughing my ___ off
Hopes this helps a little!!!