BRB  -  Be right back

BTW  -  By the way

CF - Colin Firth

DH  -  Dear husband

DS/DD  -  Dear son/Dear daughter

FS - Firth Sisters

GMTA  -  Great minds think alike

IM(H)O  -  In my (humble) opinion

LOL  -  Laughing out loud

ODB  -  Our Dear Boy

OT  -  Off topic

ROFLMAO  -  Rolling on the floor
laughing my ass off

SAF - Sexy as fuck

SAGO - Sexier as gets older

SOAS - Sex on a Stick

Continued here