LMK
Let me know
ASAP
As soon as possible
IMO
In my opinion
ROFL
Rolling on floor laughing
4EAE
Forever and ever
CYE
Check your email
FYI
For your information
2NITE
Tonight
BTW
By the way
ILY
I love you
GR8
Great
CUL8R
See you later
FAQ
Frequently asked questions
BDAY
Birthday