CODES...help me please

Ok, so you can tell I'm new at this whole thing by my question:
What are the codes you all use. I figured out FMIL is Future Mother In Law but what is DH, FI, etc...could you give me the 'LINGO' Thanks a bunch!

I found this thread to help you Lingo for Newbies

Thanks so much that was VERY helpful!!!!! You da best!

I know I'll feel stupid when I get the answer, but what is LOL?

my guesses were 'laugh out loud' or 'labor of love'

Somebody set me straight!

Laugh(ing) out loud!!! Just like the emoticon!!

THANK YOU!