Some commonly used abbreviations on forums, blogs, and Youtube.
Lengths SL- Shoulder Length, APL- Armpit Length, BSL- Bra Strap Length, WL- Waist Length
Transitioning- BC- Big Chop
Afro TWA- Teeny Weeny Afro, BAA-Big Ass Afro
Others: EVOO- Extra Virgin Olive Oil
Thats all I can think of right now